The Colorado legislature recently considered (but did not ultimately pass) legislation
to require motorists to leave three feet between them and a bicyclist they are
passing.
http://bicyclecolo.org/site/page.cfm?PageID=76
Arizona has a law that requires three feet of space:
Section 1. Title 28, chapter 3, article 7, Arizona Revised Statutes, is amended by adding section 28-735, to read:
28-735. Overtaking bicycles; civil penalties
A. When overtaking and passing a bicycle proceeding in the same direction, a person driving a motor
vehicle shall exercise due care by leaving a safe distance between the motor vehicle and the bicycle of not
less than three feet until the motor vehicle is safely past the overtaken bicycle.
B. If a person violates this section and the violation results in a collision causing:
1. Serious physical injury as defined in section 13-105 to another person, the violater is subject to a
civil penalty of up to five hundred dollars.
2. Death to another person, the violater is subject to a civil penalty of up to one thousand dollars.
C. Subsection B of this section does not apply to a bicyclist who is injured in a vehicular traffic lane
when a designated bicycle lane or path is present and passable |