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Parking Maneuvers

Parking Maneuvers. Overview of Presentation. Project Objective Saturation flow rate-Definition Adjustment factors to determine saturation flow-rate Data analysis in areas of interest Downtown Northwest-Pearl District Streets of Tanasbourne. Project Objective.

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Parking Maneuvers

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  1. Parking Maneuvers

  2. Overview of Presentation • Project Objective • Saturation flow rate-Definition • Adjustment factors to determine saturation flow-rate • Data analysis in areas of interest • Downtown • Northwest-Pearl District • Streets of Tanasbourne

  3. Project Objective • Examine urban areas with high on-street parking turnover. • Determine average times for parking maneuvers. • Entrance times • Exit times • Determine number of parking maneuvers per hour. • Can be obtained through field study • Smart park meters give data obtaining to maneuvers per hour • Calculate parking adjustment factor fp based on the HCM average parking maneuver time versus measured field times.

  4. Saturation Flow-Rate • The saturation flow rate is the maximum hourly volume that can pass through an intersection, from a given lane group or group of lanes (Mannering et. Al pg. 226.) • The HCM states a typical base saturation flow rate of 1900 (pc/h/ln) is possible at intersections. • When calculating base saturation flow there are a number of adjustment factors which reduce flow. • These factors include; lane widths, grades, parking maneuvers, bus blockage, pedestrian and bicycle activity, etc.

  5. Saturation Flow Rate Adjustment Factors • Base saturation flow rate is 1900 pc/h/ln. • The variable fp is the parking adjustment factor in the saturation flow formula. • The parking adjustment factor is a function of the number of lanes in a lane group and number of parking maneuvers per hour. • The HCM states that each maneuver (either in or out) is assumed to block traffic in the lane next to the parking maneuver for an average of 18 seconds. • If more than a 180 parking maneuvers exist, a practical limit of 180 should be used (i.e. ).

  6. Parking Maneuver Defaults • The number of parking maneuvers is best measured in the field. • In the absence of such data, it can be assumed from the number of parking spaces within 250 ft of the stop line and the average turnover rate for each space. • The number of spaces within 250 ft of the stop is estimated assuming 25 ft per space. • Therefore, each turnover (one car leaving and one car entering) generates two parking maneuvers. • Exhibit 10-20 gives default values for maneuvers per hour, based on 80 percent occupancy of the spaces.

  7. Downtown Portland Measured average parking maneuver time was 4.73 seconds.

  8. The Pearl District Measured average parking maneuver time was 9 seconds.

  9. Streets of Tanasbourne Measured average parking maneuver time was 6.95 seconds.

  10. Conclusions • The assumed time of a parking maneuver as stated by the HCM is very conservative. • The parking adjustment factor plays a significant role in calculating saturation flow rate. • Analysis shows that parking maneuver times vary by location. • More research necessary to finalize these values.

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