Table 6.5. Typical Lane and Shoulder Widths* |
Lane Type |
Lane Width
(ft) |
Inside Shoulder (ft)
No Curb and Gutter |
Outside
Shoulder (ft)
No Curb and Gutter |
Outside Shoulder With Curb and Gutter (ft) |
Overall** |
Paved |
Overall** |
Paved |
Arterial or Collector |
12 |
6 |
2 |
10 |
6.5 |
16 |
Urban Type A |
11 |
|
|
|
|
16 |
Urban Type B |
12 |
|
|
|
|
|
Local Roads
(if ADT<400, refer to AASHTO Green Book) |
12 |
6 |
2 |
10 |
6.5 |
|
Shared Bike Routes |
14 |
|
|
|
|
|
Designated Bike Routes |
4 |
|
|
|
|
|
Channelized Turn Lane |
16 (min.) |
|
|
|
|
|
HOV |
14 |
|
|
|
|
|
Two Way Left Turn Lane (TWLTL) |
14 |
|
|
|
|
|
TWLTL with provision for future 20-ft.raised median |
14 |
See special details for other roadway dimensions |
One-Way Roadway, Single Lane |
16 |
|
|
|
|
|
One-Way Roadway, Multilane |
12 |
|
|
|
|
|
Loop Ramp |
|
|
|
|
|
|
Free Flow Ramps |
|
|
|
|
|
|
Single Lane Entrance/Exit Ramps |
16 |
6 |
4 |
12 |
10 |
|
Multi Lane Entrance/Exit Ramps |
12 |
6 |
4 |
12 |
10 |
|
Interstates & Freeways |
12 |
Refer to the current AASHTO publication,
A Policy on Design Standards -- Interstate System |
Notes:
* The need for additional widening shall be determined in accordance with AASHTO recommendations.
** Overall shoulder width does not include additional width required for the installation of barrier.
|