Superelevation at Terminals

Superelevation at ramp terminals should be developed using the following guidelines. The rate of superelevation at the entrance and exit nose should be selected on the basis of the design speed of the ramp at the nose. All transverse changes or breaks in superelevation should be made at joint lines in concrete pavement. In the case of bituminous pavement, the superelevation breaks should occur in the same locations as they would in concrete pavement. For high-speed terminals, the transverse breaks in superelevation cross slope should not exceed a differential of 0.032 ft/ft (0.032 m/m) at the mainline pavement edge or 0.050 ft/ft (0.050 m/m) at other locations. When a double break occurs on longitudinal joints less than 6 ft (1.83 m) apart, it should not exceed a total differential of 0.032 ft/ft (0.032 m/m), if adjacent to the mainline, or 0.050 ft/ft (0.050 m/m) elsewhere. On low — speed terminals, the transverse breaks in superelevation cross slope should not exceed a differential of 0.05 to 0.06 ft/ft (0.05 to 0.06 m/m). For high-speed terminals, the rate of rotation of a superelevated ramp pavement or speed change lane pavement should be in accordance with rates from Table 2.13. Where possible, the terminal area pavement and shoulder should slope away from the mainline pavement so that a minimum amount of water drains across the mainline pavement.