Signalized Intersections

Index of Strategies by Implementation Timeframe and Relative Cost

Exhibit IV-1 provides a classification of strategies according to the expected timeframe and relative cost for this emphasis area. In several cases, the implementation time will be dependent upon such factors as the agency's procedures, the need for additional right-ofway (ROW), the number of stakeholders involved, and the presence of any controversial situations. The range of costs may also be somewhat variable for some of these strategies, due to many of the same factors. Placement in the table below is meant to reflect costs relative to the other strategies listed for this emphasis area only. The estimated level of cost is for the commonly expected application of the strategy, especially one that does not involve additional ROW or major construction, unless it is an inherent part of the strategy.

Exhibit IV-1
Classification of Strategies

Time Frame for Implementation	Relative Cost to Implement and Operate
Time Frame for Implementation	Low	Moderate	Moderate to High	High
Short (less than a year)	17.2 A1 Employ multiphase signal operation 17.2 A2 Optimize clearance intervals 17.2 A3 Restrict or eliminate turning maneuvers (including right turns on red) 17.2 A6 Improve operation of pedestrian and bicycle facilities at signalized intersections 17.2 A7 Remove unwarranted signal 17.2 B3 Improve geometry of pedestrian and bicycle facilities 17.2 C1 Clear sight triangles 17.2 D1 Improve visibility of intersections on approach(es) 17.2 D2 Improve visibility of signals and signs at intersections 17.2 E1 Provide public information and education 17.2 F1 Restrict access to properties using driveway closures or turn restrictions 17.2 F2 Restrict crossmedian access near intersections 17.2 G5 Restrict or eliminate parking on intersection approaches	17.2 E2 Provide targeted conventional enforcement of traffic laws 17.2 G4 Relocate signal hardware out of clear zone	——	——
Medium (1-2 years)	——	17.2 A4 Employ signal coordination 17.2 A5 Employ emergency vehicle preemption 17.2 B1 Provide/improve leftturn channelization 17.2 B2 Provide/improve rightturn channelization 17.2 E3 Implement automated enforcement of redlight running (cameras) 17.2 E4 Implement automated enforcement of approach speeds (cameras) 17.2 E5 Control speed on approaches 17.2 G1 Improve drainage in intersection and on approaches 17.2 G2 Provide skid resistance in intersection and on approaches 17.2 G3 Coordinate closely spaced signals near at-grade railroad crossings	——	——
Long (more than 2 years)	——	——	——	17.2 B4 Revise geometry of complex intersections 17.2 B5 Construct special solutions 17.2 C2 Redesign approaches