Design and Management of Historic Roads (2012) / Chapter Skim
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A-1 APPENDIX A: FACTORS ASSOCIATED WITH INTERSECTION DESIGN AND OPERATIONS 1 Introduction Understanding how movements at intersections are controlled facilitates developing and considering alternatives to minimize the enlargement of intersections while increasing their safety and efficiency. Such alternatives may facilitate efforts to preserve or protect historic features of roadways that otherwise would be removed or destroyed if additional lanes were added to existing intersections.
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Appendix A: Factors Associated with Intersection Design & Operations A-2 3.1 Assignment by Signing Where traffic volumes are extremely low on both the major (road with higher traffic volume) and the minor (road with lower traffic volume)
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Appendix A: Factors Associated with Intersection Design & Operations A-3 A signal phase is the permitted movements that receive a specified amount of green time plus yellow time and all red time allocated to the movements. The amount of green time displayed to each phase is generally proportional to the highest traffic volume per lane for a movement which is moving during that phase.
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Appendix A: Factors Associated with Intersection Design & Operations A-4 of service (LOS) (a graded system of expressing relative amounts of delay incurred by motorists using the facility)
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Appendix A: Factors Associated with Intersection Design & Operations A-5 moving through the intersection. Adding left-turn lanes does not necessarily require a separate signal phase for the left turners on the major roadway.
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Appendix A: Factors Associated with Intersection Design & Operations A-6 4.2 Alternatives to Lane Additions Instead of adding lanes, it may be possible to increase intersection capacity by using new intersection designs known collectively as non-traditional intersections. Non-traditional intersections include continuous flow intersections, paraflow intersections, quadrant intersections, roundabouts, and superstreets to mention a few.
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Appendix A: Factors Associated with Intersection Design & Operations A-7 vehicle, which accounts for less than 2% of total users. Large radii can encourage the speed of turning motorists, which can affect the safety of pedestrians crossing in the crosswalks and lengthen the distance of their crossing; thereby, providing additional exposure to pedestrians.
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