Draft Canadian Railway-Roadway Grade Crossings Standards ...

Normally, where the crossing angle is 90°, a railway crossing sign, warning signals, or gate arm is
located 3 m from the nearest rail, measured perpendicular to the rail and the stopped position of
the front of a vehicle would be 5 m for the calculation of clearance distance.
Where the crossing angle is greater or less than 90°, the distance along the road between such
devices and the nearest rail will be greater than 3 m, and the stopped position of the front of a
vehicle would be greater than 5 m for the calculation of clearance distance.
The grade crossing clearance distance (cd) is calculated as shown in Figure 4-1.
Vehicle Travel Distance
4.6 The total distance the vehicle must travel to pass completely through the clearance distance in
Figure 4-1 is computed using the following formula:
Where,
s = cd + L
s = distance the road vehicle must travel to pass through the grade crossing clearance
distance (m)
cd = grade crossing clearance distance [Figure 4-1]
L = length of the grade crossing design vehicle [Table 4-1]
Page | 9