Warrants #4 and #5. A total of 148 pedestrians were observed crossing Patterson Road at Shafor Boulevard during the 8-hour data collection periods. Due to the intersection being located near the Oakwood Community Center and about 1/3rd of a mile from Oakwood Junior and Senior High School, a gap analysis was performed at the intersection to understand the impact of pedestrian crossings without the existing signal.
Gap analysis was performed using a Poisson Distribution methodology to determine if an acceptable number of gaps are available to cross Patterson Road at the AM, midday, and PM peak hours. Acceptable numbers of gaps to accommodate pedestrians are assumed to be one per minute (60 gaps per hour). The available number of gaps is dependent on total bidirectional volume on Patterson Road, crossing distance from curb ramp to curb ramp (measured at 30 ft), and walking speed (3.5 ft/s was assumed). The available gaps during peak hours were calculated using the following equation:
- λ = Total bidirectional volume at Patterson Rd @ Shafor Blvd
- t = Crossing Time = 30 ft3.5 ft/s = 8.6 seconds
The resulting number of gaps for each peak hour volume are shown in Figure 17C.
The gap analysis shows that the number of gaps to cross Patterson Road is over 148 at this intersection during peak hours. The acceptable number of gaps is 60 per hour (i.e., one opportunity to cross every minute). With acceptable headway available to cross the major street at this location, warrants #4 and #5 are NOT satisfied based on gap analysis.
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