Street Design Manual

Table 18 Intersection Stopping Sight Distance summarizes the required sight distance (L) along the road for a stopped vehicle to cross the street. If a roadway is divided with a median width of 20 feet or more for passenger vehicle crossings, or 40 feet or more for truck crossings, the required sight distance may be based on a two-stop crossing and consideration given to the width of each one-way pavement at a time.

Table 18 Intersection Stopping Sight Distance

Minimum Intersection Sight Distance (ft)

3 Lane Undivided or 2 Lane Divided w/ 12' median

5 Lane Undivided or 4 Lane Divided w/ 12' median

2 Lane Undivided

4 Lane Undivided

Speed limit (mph)

LEFT TURN

RIGHT TURN

LEFT TURN

RIGHT TURN

LEFT TURN

RIGHT TURN

LEFT TURN

RIGHT TURN

20 25 30 35 40 45 50 55

230 280 340 390 450 500 560 610

200 240 290 340 390 430 480 530

240 300 360 420 480 530 590 650

200 240 290 340 390 430 480 530

250 320 380 440 500 570 630 690

200 240 290 340 390 430 480 530

270 340 400 470 530 600 670 730

200 240 290 340 390 430 480

530 Notes: The sight distances shown in this chart shall be considered approximate only for a passenger car to turn onto the major street from a side street grade of 3% or less. The distances from this chart are measured along the CL of the roadway (Sight Distance Length L from illustration). The sight line (or resulting sight distance easement line if outside r/w) shall begin at the driver's eye approximately 15 feet from EP and end at the center of the closest oncoming lane. Depending on specific site conditions additional adjustments may be required to sight distances. These factors may include, but are not limited to, side street approach grades greater than 3%, median widths of the crossing street, skewed intersections, or other variables that would affect sight distances. Any adjustments to the above sight distances shall be in accordance with section "Intersection Control" of the latest edition of the AASHTO Manual.

Raleigh Street Design Manual – Page 103