Signalized Intersections: Appendix 10

Table of Crash Attributes vs. Candidate Strategies for Crashes Occurring at Signalized Intersections

Exhibit 1 is an index of candidate strategies for addressing crashes occurring at signalized intersections. The strategies listed are those that are covered in the Guide for the AASHTO Strategic Highway Safety Plan addressing crashes at signalized intersections.

In many cases, roadway inventory data may be available as an additional source to help relate problems to candidate strategies. Where the scope of the analysis is limited to a relatively small portion of the road system, field studies can provide needed details to help select the appropriate strategies to consider. Other sources of data are sometimes available, as well, which can help in the analysis. Details of the problem identification process are covered in the discussion of Step 1 of the Model Implementation Process.

Many of the strategies listed in the guide for crashes at signalized intersections are potentially applicable to several of the crash factors. Even where this is not the case, it may occur that more than one crash factor will be identified as significantly associated with the problem. In these cases, the sum of strategies associated with each of the factors, as listed in Exhibit 1, should be considered.

EXHIBIT 1.
Strategies vs Crash Attributes

  Crash Type (Combination of MMUCC1 Elements C6 and C8)
Manner of Collision where First Harmful Event is Collision with Another Motor Vehicle First Harmful Event in Crashes Involving Single-Motor Vehicle
Objective 17.2 A: Reduce frequency and severity of intersection conflicts through traffic control and operational improvements
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 A4 Employ signal coordination •   •         •    
17.2.A5 Implement emergency vehicle preemption at signals • • • • • • • •    
17.2 A6 Improve intersection traffic control of pedestrian and bicycle facilities     •     •   •    
17.2 A7 Remove unwarranted signal     •              
Objective 17.2 B: Reduce frequency and severity of intersection conflicts through geometric improvements
17.2 B1 Provide/improve left-turn lane channelization • • • • •          
17.2 B2 Provide/improve right-turn lane channelization •   •     •   •    
17.2 B3 Improve geometry of pedestrian and bicycle facilities     •     •   •    
17.2 B4 Revise geometry of complex intersections • • • • • •   •    
17.2 B5 Construct special solutions • • • • • •   •    
Objective 17.2 C: Improve sight distance at signalized intersections
17.2 C1 Clear sight triangles at intersections •   •              
17.2 C2 Redesign approaches to intersections •   •              
Objective 17.2 D: Improve driver awareness of intersections and signal control
17.2 D1 Improve visibility of intersections on approach(es) • • •     •   •    
17.2 D2 Improve visibility of signals and signs at intersections •   •         •    
Objective 17.2 E: Improve driver compliance with traffic control devices
17.2 E1 Provide public information and education • • • • • •   •    
17.2 E2 Provide targeted conventional enforcement of traffic laws • • • • • •   •    
17.2 E3 Implement automated enforcement of red-light running (cameras) •   •     •   •    
17.2 E4 Implement automated enforcement of approach speeds (cameras) • • • • • •   •    
17.2 E5 Implement traffic calming measures on intersection approaches • • • • • •   •    
Objective 17.2 F: Improve access management near signalized intersections
17.2 F1 Restrict access to properties, using driveway closures or turn restrictions •   •     •   •    
17.2 F2 Restrict cross median access near intersections •   • • •     •    
Objective 17.2 G: Other improvements
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 •   •              
17.2 G4 Relocate signal hardware out of clear zone •                 •
17.2 G5 Restrict or eliminate parking on intersection approaches •   • •     •      

1Model Minimum Uniform Crash Criteria (MMUCC) Guide, Second Edition, 2003 (http://www-nrd.nhtsa.dot.gov/pdf/nrd-30/NCSA/MMUCC/2003/MMUCC_02.pdf)