11. Roadway Narrowing
Roadway narrowing can be achieved in several different ways:
1) Lane widths can be reduced (to 9, 10, or 11 feet) and excess asphalt striped with a bicycle lane or paved shoulders;
2) Travel lanes can be removed (see 12); or,
3) the street can be physically narrowed by extending sidewalks, landscaped areas, or by adding on-street parking within the former curb lines.
This can reduce vehicle speeds along a roadway section and enhance movement and safety for pedestrians. Bicycle travel will also be enhanced and bicyclist safety improved when bicycle lanes are added.
Adding striped shoulders or on-street bike lanes can cost as little as $1000 per mile if the old paint does not need to be changed. The cost for restriping a mile of street to bike lanes or reducing the number of lanes to add on-street parking is $5,000–$10,000 depending on the number of old lane lines to be removed. Constructing a raised median or widening a sidewalk can cost $100,000 or more per mile.