Appendix K Traffic Signal Monitoring and Evaluation Checklist
The following checks should be made when monitoring and evaluating the operation of a site:
- Are the signs and road markings appropriate to the phasing as designed?
- Are the kerbside controls adequate for the required capacity of the site?
- Are traffic flows actually as predicted or assumed?
- Is traffic avoiding the signalised site and creating congestion elsewhere?
- Is equipment (controller) operating as designed?
- Are signal phasings and timings (Section 6.7.12 and Appendix G) adequate to ensure that:
- The yellow times in relation to vehicle stopping characteristics, and times provided between phases to clear traffic from the controlled area are satisfactory?
- Traffic is not held unnecessarily at a red signal when adequate gaps exist in a running movement?
- Are delays to vehicles and pedestrians on each approach at satisfactory levels?
- Are the numbers of vehicles left in a queue at the termination of the green period and the number of vehicles stopped more than once in each queue at satisfactory levels?
- Is the occurrence of queue overflows from turning lanes blocking other movements minimised?
- If coordination exists, are good progressions being obtained as planned? (Section 6.9)
- Does platooning by upstream signals or interference from downstream signals indicate a need for coordination? (Section 6.9)
- Are vehicle detector loops appropriately located to detect traffic as intended in both the passage and presence mode, and is waiting traffic standing in the position anticipated in the design? (Section 6.8)
- Are unusual vehicles being missed by detectors, and are they in sufficient numbers to justify special detection techniques?