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| Keywords: seattle sdot mutcd aashto fhwa bike bicycle cycling safety standards lane marking pavement substandard hazard It may not seem like much, but Seattle DOT officially uses substandard bicycle markings for the city's notoriously narrow bike lanes. FHWA says the bike lane marking should be 40 inches wide. That's not arbitrary, it's the minimum physical width for the operation of a bicycle according to AASHTO engineering standards -- if there isn't room for a 40-inch-wide bicycle marking, there isn't room for a bicycle. (NOTE: AASHTO has increased their minimum bicycle operating width to 48" in their latest edition.) But Seattle's official Standard Plans call for only 90% of the MUTCD-approved width, 36 inches instead of 40. FHWA standards (2004): mutcd.fhwa.dot.gov/ser-shs_millennium.htm Seattle Standard Plans (2014): www.seattle.gov/util/engineering/standardspecsplans/ It may not seem like much, but Seattle DOT officially uses substandard bicycle markings for the city's notoriously narrow bike lanes. FHWA says the bike lane marking should be 40 inches wide. That's not arbitrary, it's the minimum physical width for the operation of a bicycle according to AASHTO engineering standards -- if there isn't room for a 40-inch-wide bicycle marking, there isn't room for a bicycle. (NOTE: AASHTO has increased their minimum bicycle operating width to 48" in their latest edition.) But Seattle's official Standard Plans call for only 90% of the MUTCD-approved width, 36 inches instead of 40. FHWA standards (2004): mutcd.fhwa.dot.gov/ser-shs_millennium.htm Seattle Standard Plans (2014): www.seattle.gov/util/engineering/standardspecsplans/ | ||||
