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Technical Procedures I * If either the maximum green time or the cycle time is not known, use the through and right-turn volumes for -- the approach divided by the number of lanes. Add the number of !eft-turns calculated in the change interval V~ to the number -- Ill calculated in the permiRed left for a total number of left-turns which can clear without a protected left Vt.. If the number of left-turns calculated above CLeft turn capacity) is more than those estimated for the project, no protected left-turn phase is needed. If the number of left ' turns calculated above is less than the left turn demand, operating difficulties and increasing delays will be experienced. II STEP 5: Adjust Turning Volumes t Two situations may require adjustment of observed turning volumes: 1. Right turns where no separate right turn lane is provided and significant pedestrian activity exists, i 2. Left turns where no separate left turn lane is provided. The PCE adjustments recommended in Circular 212 (see Appendix A of the -- Technical Procedures) should be used. If the VCCC model is used, adjustments to the turn volumes should be made prior to entering into the program. STEP 6. Calculate Volume-to-Capacity Ratio by Movement The volume-to-capacity ratio of each of the 12 individual movements and any combined movements of the intersection are calculated as follows: ,, Right turn volumes from exclusive right turn lanes are adjusted for right turns on red by the non-conflicting !eft turn volumes with a minimum reduction of 90 _ vehicles per hour. (Non-conflicting !eft tun go concurrently with the right turn. For example, the non-conflicting !efx turn for the northbound right turn is the westbound !eft turn.) _ ., Determine the capacity of each movement and each combined movement from Table 9. -- J --~t,,,,.so 48 '