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Traffic Signals 101

Traffic Signals 101. Topic 9 Pedestrian. Pedestrian. Need for Pedestrian Control Safety The primary need for pedestrian control is to reduce the number and severity of traffic accidents involving pedestrians Traffic Flow

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Traffic Signals 101

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  1. Traffic Signals 101 Topic 9 Pedestrian

  2. Pedestrian • Need for Pedestrian Control • Safety • The primary need for pedestrian control is to reduce the number and severity of traffic accidents involving pedestrians • Traffic Flow • Where pedestrian flow is heavy, special controls may be necessary to prevent reduction in capacity

  3. Pedestrian • Pedestrian Timing Requirements • The pedestrian timing requirements include: • The Walk Interval • Flashing Don’t Walk Interval (Pedestrian Clearance)

  4. Pedestrian • Pedestrian Timing Requirements • Walk: The walk interval is typically 4 to 7 seconds. This allows pedestrians adequate time to leave the curb and begin crossing • MnDOT typically uses 7 seconds, based on MN MUTCD Guidance • Under special circumstances, such as at a school crossing with numerous pedestrians, walk times may need to exceed 7 seconds

  5. Pedestrian • Pedestrian Timing Requirements • Flashing Don’t Walk (FDW) or pedestrian clearance is the time provided for a pedestrian crossing in a crosswalk, after leaving the curb or shoulder, to travel to the far side of the traveled way or to a median (D = Distance) • The calculation of the flashing don’t walk (pedestrian clearance) is: • FDW = D / R • R = Walking Rate, 3.5 feet per second according to MN MUTCD

  6. Pedestrian • MN MUTCD Figure 4E-2

  7. Pedestrian • Ped Timing Recommended Practice • For a single roadway or a divided roadway with a median island less than 6 feet wide, the pedestrian is provided time to cross the entire intersection, without stopping in the middle • WALK = 7 seconds (this may be reduced to 4 seconds if it is necessary to minimize pedestrian timing considering the other factors)

  8. Pedestrian • Ped Timing Recommended Practice • FDW = (D/R) • (time should not be less than WALK time and the time may be reduced by the yellow interval IF it is necessary to minimize pedestrian timing considering other factors)

  9. Pedestrian • Divided Roadways (with Median) • Option 1 - Cross to Median Only • (for divided roadways with median islands over 6 feet wide with pedestrian indications and button in the median) • Option 2 - Cross Completely

  10. > 6’ Median Pedestrian

  11. Pedestrian • Pedestrian Timing Requirements Example

  12. Pedestrian Excel • Pedestrian Timing Requirements Example • Assume a walking speed of 3.5 feet per second with no special pedestrian requirements • The flashing don’t walk would then be: • FDW = 82 feet / 3.5 feet per second = 23 seconds • Total Split Time (given vehicle yellow = 4 seconds and all-red = 1 second) is 35 seconds

  13. Pedestrian • Pedestrian Information Sign • To provide pedestrians with more information at the traffic signal • This sign will be available in two forms. • The pedestrian informational sign shall be used on all traffic signal installations that have pedestrian indications.

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