Superelevation Transition

Superelevation Transitions - Mainline Tollway

(Based on Illinois Tollway Manuals)

Curve Parameters:

Design Agency

Delta offset

Lanes	Lane Width (ft)
Lane 1
Lane 2
Lane 3
Lane 4

P.C. STA.

P.T. STA.

Flex Lane Width (ft)

Inside Shoulder Cross-slope (%)

Outside Shoulder Cross-slope (%)

SE Distribution (%)

Design Speed (MPH)

Curve Radius (ft)

Calculated Parameters :

RS = 250

W = 48 ft

Design SE = 5.4

Lane Adjustment Factor bw = 0.625

Superelevation transition lengths:

L = 405.00 ft

L1 = 150.00 ft

L2 = 112.50 ft

L3 = 37.50 ft