Procedure for curve warning signing, delineation, and advisory speeds for horizontal curves : final report  Page 33 
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22 that there could be a difference between collisions that actually occur on the curve and collisions that are related to the curve. This study did not investigate this difference. In the data analysis tables presented in this paper, some column totals might not sum to 100% because of rounding. The data are presented as collision percentages rather than as collision frequencies for easier comparison. In the tables, ―2lane curve collisions‖ represent the collisions reported on twolane curves, ―all 2lane collisions‖ represent the collisions reported on all twolane roadways throughout NC, and ―all roads collisions‖ represent the collisions reported on all roads throughout NC. 4.4.1 Road Characteristics Aspects of the roadway itself significantly affect collisions. Table 2 reports on geometric roadway characteristics for twolane and allroad collisions. The terms in Table 2 are, for the most part, well understood. However, their precise numerical definition does not exist on the collision data reporting form. Instead, their use by a police officer can vary. Thus, in Table 2 the term level grade is taken to mean a perceptively level roadway. The data obtained by the police officer and reported herein is thus qualitative, although likely reasonable. Table 2. Horizontal Curve Collision Geometric Roadway Characteristics Road CharacteristicGradeLevel77%78%Hillcrest4%4%Grade18%17%Bottom1%1%Level56%53%Hillcrest4%6%Grade37%38%Bottom3%3%OtherN/A0%1%UncodedN/A100%99%All 2Lane Collisions All Roads Collisions 68%6%80%21%14%10%TangentCurve Table Table Table 2 shows that 21% of all twothat 21% of all twothat 21% of all twothat 21% of all twothat 21% of all twothat 21% of all twolane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often on roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twolane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather than on tangent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twolane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all twolane collisions and 45% of all lane collisions and 45% of all lane collisions and 45% of all lane collisions and 45% of all lane collisions and 45% of all lane collisions and 45% of all lane collisions and 45% of all lane collisions and 45% of all lane collisions and 45% of all lane collisions and 45% of all statewide collisions (statewide collisions (statewide collisions (statewide collisions (statewide collisions (statewide collisions (statewide collisions (Table 3Table 3Table 3). It appears that r). It appears that r). It appears that r). It appears that r). It appears that r). It appears that r). It appears that rural, ural, ural, horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.
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Title  Procedure for curve warning signing, delineation, and advisory speeds for horizontal curves : final report  Page 33 
Full Text  22 that there could be a difference between collisions that actually occur on the curve and collisions that are related to the curve. This study did not investigate this difference. In the data analysis tables presented in this paper, some column totals might not sum to 100% because of rounding. The data are presented as collision percentages rather than as collision frequencies for easier comparison. In the tables, ―2lane curve collisions‖ represent the collisions reported on twolane curves, ―all 2lane collisions‖ represent the collisions reported on all twolane roadways throughout NC, and ―all roads collisions‖ represent the collisions reported on all roads throughout NC. 4.4.1 Road Characteristics Aspects of the roadway itself significantly affect collisions. Table 2 reports on geometric roadway characteristics for twolane and allroad collisions. The terms in Table 2 are, for the most part, well understood. However, their precise numerical definition does not exist on the collision data reporting form. Instead, their use by a police officer can vary. Thus, in Table 2 the term level grade is taken to mean a perceptively level roadway. The data obtained by the police officer and reported herein is thus qualitative, although likely reasonable. Table 2. Horizontal Curve Collision Geometric Roadway Characteristics Road CharacteristicGradeLevel77%78%Hillcrest4%4%Grade18%17%Bottom1%1%Level56%53%Hillcrest4%6%Grade37%38%Bottom3%3%OtherN/A0%1%UncodedN/A100%99%All 2Lane Collisions All Roads Collisions 68%6%80%21%14%10%TangentCurve Table Table Table 2 shows that 21% of all twothat 21% of all twothat 21% of all twothat 21% of all twothat 21% of all twothat 21% of all twolane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal lane road reported collisions occur on horizontal curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often curves, compared to 14% among all roads statewide. Curve collisions occur more often on roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twoon roadways sections with a grade (37% for all twolane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather lane roads, 38% for all roads) rather than on tangent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twongent sections on a grade (18% for all twolane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The lane roads, 17% for all roads). The reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all reported curve collisions primarily occur in rural locations (70%), compared to 62% of all twolane collisions and 45% of all lane collisions and 45% of all lane collisions and 45% of all lane collisions and 45% of all lane collisions and 45% of all lane collisions and 45% of all lane collisions and 45% of all lane collisions and 45% of all lane collisions and 45% of all lane collisions and 45% of all statewide collisions (statewide collisions (statewide collisions (statewide collisions (statewide collisions (statewide collisions (statewide collisions (Table 3Table 3Table 3). It appears that r). It appears that r). It appears that r). It appears that r). It appears that r). It appears that r). It appears that rural, ural, ural, horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions.horizontal curves are particularly susceptible to collisions. 