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A. Street design of narrow streets and compact intersections requires designers to pay close attention to the operational needs of transit, fire and rescue, waste collection and delivery trucks. For this reason, early coordination with transit, fire and rescue, waste collection and other stakeholder groups is essential.

B. More regular encroachment of turning vehicles into opposing lanes will occur at compact intersections. Therefore, frequency of access, traffic volumes and the speeds on intersecting streets at those intersections must be considered when designing intersections. For fire and rescue, determination of the importance of that street for community access should be determined, e.g. primary or secondary access.

C. The designer should use turning templates or software to evaluate intersections to ensure adequate operation of vehicles can occur. Location of on street parking around intersections should be evaluated during this analysis to identify potential conflicts between turning vehicles and on street parking. Bike lanes and on-street parking will increase the effective curb return radius, when curb extensions are not employed, by providing more room for the wheel tracking of turning vehicles.

D. The following table provide the allowed curb radius range by movement type and speed. The dimensions require the provision of an effective curb radius and/or mountable curbs that meet the needs of fire and emergency access.

Table 5.10.050.A. Curb Radius

Movement Type

Speed

Curb Radius

Yield

<20 mph

5' - 10'

Slow

20-25 mph

10' - 15'

Low

30-35 mph

15' - 20'