Table 1-Safe Sight Distance for passenger cars and single unit trucks exiting from driveways onto two-lane roads.
Posted Speed (mph) | Safe Sight Distance-Left1 (feet) | Safe Sight Distance-Right1 (feet) |
25 | 250 | 195 |
35 | 440 | 350 |
45 | 635 | 570 |
55 | 845 | 875 |
1 Measured from a vehicle ten feet back of the pavement edge.
Table 2-Safe Sight Distance for buses and combinations exiting from driveways onto two-lane roads.
Posted Speed (mph) | Safe Sight Distance-Left1 (feet) | Safe Sight Distance-Right1 (feet) |
25 | 400 | 300 |
35 | 675 | 625 |
45 | 1225 | 1225 |
55 | 2050 | 2050 |
1 Measured from a vehicle ten feet back of the pavement edge.
Table 3-Safe Sight Distance for passenger cars and single unit trucks exiting from driveways onto four and six-lane roads.
Posted Speed (mph) | Safe Sight Distance-Left1 (feet) | Safe Sight Distance-Right2 (feet) |
25 | 175 | 195 |
35 | 300 | 350 |
45 | 500 | 570 |
55 | 785 | 875 |
1 Measured from a vehicle ten feet back of the pavement edge to a vehicle approaching in the outside lane.
2 Measured from a vehicle ten feet back of the pavement edge to a vehicle approaching in the median lane.
Table 4-Safe Sight Distance for buses and combinations exiting from driveways onto four and six-lane roads.
Posted Speed (mph) | Safe Sight Distance-Left1 (feet) | Safe Sight Distance-Right2 (feet) |
25 | 300 | 300 |
35 | 625 | 625 |
45 | 1225 | 1225 |
55 | 2050 | 2050 |
1 Measured from a vehicle ten feet back of the pavement edge to a vehicle approaching in the outside lane.
2 Measured from a vehicle ten feet back of the pavement edge to a vehicle approaching in the median lane.
Table 5-Safe Sight Distance for passenger cars and single unit trucks entering driveways by left turns.
Posted Speed (mph) | Safe Sight Distance in Feet 1 | ||
2-Lane | 4-Lane | 6-Lane | |
25 | 190 | 205 | 220 |
35 | 300 | 320 | 345 |
45 | 445 | 470 | 500 |
55 | 610 | 645 | 680 |
1 Measured from the point where a left-turning vehicle stops to a vehicle in the outside lane.
Table 6-Safe Sight Distance for buses and combinations entering driveways by left turns.
Posted Speed (mph) | Safe Sight Distance in Feet 1 | ||
2-Lane | 4-Lane | 6-Lane | |
25 | 330 | 360 | 390 |
35 | 485 | 530 | 575 |
45 | 690 | 750 | 810 |
55 | 905 | 990 | 1075 |
1 Measured from the point where a left-turning vehicle stops for a vehicle in the outside lane.
SSSD = 1.47 Vt + V2 30 (f+g)
SSSD = Minimum safe stopping sight distance (feet).
V = Velocity of vehicle (miles per hour).
t = Perception time of motorist (average = 2.5 seconds).
f = Wet friction of pavement (average = 0.30).
g = Percent grade of roadway divided by 100.
67 Pa. Code § 441.8
This section cited in 67 Pa. Code § 441.6 (relating to general conditions).