Street Design Manual

Table 15 Left Turn Lane Warrants for Two-Lane Roads OPPOSING VOLUME (veh./hr.) ADVANCING VOLUME (veh./hr.) 5% Left Turns 10% Left Turns 20% Left Turns

30% Left Turns

40-mph Operating Speed 800

330 410 510 640 720 280 350 430 550 615 230 290 365 450 505

240 305 380 470 515 210 260 320 400 445 170 210 270 330 370

180 225 275 350 390 165 195 240 300 335 125 160 200 250 275

160 200 245 305 340 135 170 210 270 295 115 140 175 215

600 400 200 100

50-mph Operating Speed 800

600 400 200 100

60-mph Operating Speed 800

600 400 200 100

240 Note: For operating speeds not shown, interpret between given values

Raleigh Street Design Manual – Page 90