Describe the factors that must be taken into account in the design of bicycle paths.
What will be an ideal response?
The design criteria for bicycle paths are somewhat similar to those for
highways, but some of these criteria are governed by bicycle operating
characteristics, which are significantly different from those of automobiles.
Important design considerations for a safe bicycle path include the path width, the
design speed, the horizontal alignment, and the vertical alignment. The minimum
width specified by AASHTO for a 2-way path is 10 ft. and 5 ft. for a 1-way path.
Uniform graded shoulders of at least 2 ft should be provided on either side.
AASHTO recommends a design speed of 20 mph for paved paths or 15 mph for
unpaved paths. Design speeds should be increased for grades greater than 4%.
Superelevation rates for bicycle paths vary from 2% to 5% and coefficients of
side friction should vary from 0.30 to 0.22 for paved paths and 0.15 to 0.11 for
unpaved paths. Grades should not exceed 5%.
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