Street Design Manual

Section 12.4.2 Curb Return Radii A. Public street Intersections shall provide appropriate curb radii using the Table 1 Design Vehicle Table in order to allow the design vehicle to safely complete a turn without encroaching on adjacent Streetscape elements, including sidewalks and landscaping. B. Designers should take into account bicycle lane width and parking lane width when designing curb radii, as the travel lane offset allows for a larger effective radius for large vehicles. When a design vehicle larger than a Passenger Vehicle (P) is used and there are multiple receiving lanes, the design should account for the ability of the turning vehicle to use all receiving lanes. C. Where on-street parking lanes are provided, curb extensions (bulb-outs) may be considered, reducing the effective crosswalk width for pedestrians. This may have an effect of increasing the required curb radius however, so care should be taken to account for the relevant design vehicle. D. Where intersection radii larger than 25 feet are required in order to accommodate large vehicles, designers should consider incorporating mountable curbs, truck aprons, or channelized turn lanes in order to minimize the impact to intersection width for pedestrians. E. Every intersection shall appropriately accommodate Emergency Vehicles: Section 12.4.3 Drainage and Green Stormwater Infrastructure A. The use of GSI practices for managing stormwater within the right-of-way is encouraged. GSI practices typically are installed behind the curb either outside of the Travelway or in a median or curb bump-out. Figure 5 shows example placement of GSI devices and additional information for several GSI practices that can be found in the City of Raleigh Standard Details.

Raleigh Street Design Manual – Page 98