15.7.5 Lane and Shoulder Widths.

Lane and shoulder widths for ramps and direct connectors are shown in
Table 15-4
Table 15-4: Ramp and Direct Connector Roadway and Shoulder Widths
Inside Shoulder Width (ft.)
Outside Shoulder Width (ft.)
Lane Width (ft.)
1-Lane Direct Conn
2 or 4
1
 Rdwy; 4
1
 Str
8
14
2-Lane Direct Conn
2 or 4
1
 Rdwy; 4
1
 Str
8
12
Ramps (uncurbed)
2 or 4
1
 Rdwy; 4
1
 Str
6 to 8
14
2
Ramps (curbed)
22
2
Notes:
1. Roadways with longitudinal traffic barriers must provide a minimum 4-ft shoulder from the travel lane edge. The shoulder across a bridge will be measured from the travel lane edge to the nominal face of rail. This provides additional offset for high-speed operation and door-opening space for vehicles stopped on the shoulder of the roadway.
2. 12-ft lanes are permissible on ramps with multiple lanes.