Mobility & Curb Rules in Seattle, WA

If you live in Seattle or are thinking about moving there, mobility & curb rules are one of those things you probably won't think about until they affect you directly. Seattle has 4 specific rules on the books covering different aspects of mobility & curb rules, and some of them might surprise you.

Red-Light Cameras

SMC 11.50.570 authorizes Seattle's automated traffic safety cameras to catch stoplight violations at signaled arterial intersections, railroad-crossing violations, and speeding in school, park, hospital, and work zones, plus transit-lane and ferry-queue violations, under RCW 46.63.210-260. SDOT must complete an equity analysis before adding or relocating a camera, and as of June 16, 2025 every new or relocated camera issues a penalty-free warning for its first 30 days.

Key details: Authority: RCW 46.63.210-260 via SMC 11.50.570. Camera uses: stoplight, rail crossing, school/park/hospital/work-zone speed. Prerequisite: SDOT equity analysis + demonstrated need. New-camera grace: 30-day warning-only period since 6/16/2025. Sample fines: $139 red-light, $237 school-zone speed, $75 transit-lane.

A stoplight, railroad-crossing, or speed-zone violation caught by an automated camera under SMC 11.50.570 is processed as a parking-style infraction under SMC 11.31.090 and 11.31.120: the schedule lists $139 for red-light and red-arrow camera violations, $237 for school-zone camera speeding, and $75 for camera violations of the transit-lane and traffic-control-obstruction rules, billed to the vehicle's registered owner unless the presumption of ownership is rebutted.

Shared E-Scooter Rules

SMC 11.46.010 tells riders of shared and personal motorized foot scooters and EPAMDs exactly where they can operate in Seattle: scooters get roadways, shoulders, alleys, bicycle lanes and public paths but not sidewalks, while EPAMDs get roadways, shoulders, sidewalks and alleys but not bicycle lanes. SDOT can also designate speed-limited zones capping EPAMDs and e-scooters at 5 mph on sidewalks, crosswalks and pedestrian zones under SMC 11.46.020.E.

Key details: Scooters: roadways/shoulders/alleys/bike lanes/paths, not sidewalks. EPAMDs: roadways/shoulders/sidewalks/alleys, not bike lanes/paths. Speed-limited zones: 5 mph cap (SMC 11.46.020.E). EPAMD roadway ban: streets posted above 35 mph. Banned areas: school playfields/playgrounds.

Operating an EPAMD or motorized foot scooter outside its authorized area, a scooter on a sidewalk, an EPAMD in a bicycle lane, or either device exceeding 5 mph in a posted speed-limited zone, violates SMC 11.46.010 or 11.46.020 and is a civil traffic infraction under SMC 11.31.010, capped at $250 per SMC 11.31.120 absent a higher statutory penalty. Riding without a helmet or carrying a passenger is a separate violation of SMC 11.46.020.

Bike Lane Rules

SMC 11.53.190 bars any motor vehicle operator from driving in a Seattle bicycle lane except to make a turning maneuver, and even then the driver must yield to every bicyclist in the lane. Camera-detected violations under this section carry a $75 base penalty per SMC 11.31.121, and the rule sits alongside SMC 11.53.195's requirement that drivers yield to bicyclists in a marked bicycle crossing.

Key details: Rule: no driving in bike lane except to turn. Yield requirement: must yield to any bicyclist in the lane. Camera-enforced: under SMC 11.50.570.A.9. Camera penalty: $75 base (SMC 11.31.121). Related rule: yield at marked bicycle crossings (SMC 11.53.195).

Driving in a bicycle lane other than to make a turn violates SMC 11.53.190 and is a civil traffic infraction. Officer-issued citations are capped at $250 under SMC 11.31.120's general ceiling, while the same violation caught by an automated traffic camera under SMC 11.50.570.A.9 carries a listed $75 base penalty per SMC 11.31.121, billed to the vehicle's registered owner.

This is not one of those rules that cities tend to ignore. Seattle actively enforces its bike lane rules requirements.

E-Bike Classes

SMC 11.14.055 adopts three e-bike classes by motor behavior, Class 1 and 3 assist only while pedaling (cutting off at 20 and 28 mph), Class 2 can propel without pedaling up to 20 mph, and SMC 11.44.120 bars Class 3 e-bikes from Seattle sidewalks except where there's no alternative route.

Key details: Motor power cap: 750 watts, all e-bike classes. Class 1 cutoff: 20 mph, pedal-assist only. Class 2 cutoff: 20 mph, throttle allowed. Class 3 cutoff: 28 mph, pedal-assist + speedometer required. Sidewalk rule: Class 3 barred absent no alternative route.

There's no separate SMC penalty schedule listed for e-bike class violations beyond the general bicycle-infraction framework in Chapter 11.44; a Class 3 e-bike ridden on a sidewalk where an alternate route exists violates SMC 11.44.120, and an e-cargo bike exceeding the 15 mph roadway/bike-lane speed cap or riding the sidewalk without a no-alternative justification violates SMC 11.44.300.

The Bottom Line

Seattle's mobility & curb rules rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Seattle is broadly strict or permissive.

Keep in mind that Seattle can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.