One thing that is an issue with many of the marked bike lanes in
Nashville, TN is that they aren't contiguous. You will come to a point
where the road narrows, such as for a bridge, and the bikes are forced
to share a lane with motor traffic. This makes bike riding at rush hour
a risky activity.
On 02/16/2017 10:38 AM, Paul Johnson wrote:
On Thu, Feb 16, 2017 at 10:11 AM, Spencer Gardner
<spencergard...@gmail.com <mailto:spencergard...@gmail.com>> wrote:
Good catch on the MUTCD language. I'm not opposed to tagging with
a bike lane and a parking lane, but then what should be used as
the assumed width of the bike lane? This has direct relevance for
my application, where I need to know how wide a bike lane is.
Would you suggest an assumed width for parking and then subtract
from the total to arrive at the operable space for people on bicycles?
Check the local standard and get a sample. Current federal guidelines
put parking at 8 feet (and is fairly typical), bicycle lanes must be 4
feet minimum, 5 feet if there's parking adjacent, measured from the
edge of the gutter pan, or if there is none, the curb face or the edge
of the roadway (being either the physical edge or the painted edge,
whichever is closer to the centerline) to the inside of the lane
marking. Oregon-specific, 6 feet any time an adjacent lane allows
motor vehicles or is oncoming. In practice, it's rare to see a lane
less than 6 feet wide anymore regardless of application because a
cargo bike, most adult tricycles and many bikes pulling trailers are a
tight squeeze in a six foot lane. It's starting to get common to see
7 foot lanes in Oregon, often with a 1 foot buffer on the left and a
two foot buffer between the right edge of the lane and the edgeline
itself, for a 10 foot single-file bike lane.
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