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.

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.

Shared E-Scooter Rules

Seattle Municipal Code Chapter 11.46 lets motorized foot scooters, gas or electric, ride on roadways, shoulders, alleys, bicycle lanes and public paths, but not on sidewalks. Riders must wear a bicycle helmet, carry no passenger, yield to pedestrians, and use lights after dark. SDOT can post 5 mph zones.

Key details: Sidewalk riding: Banned unless no alternative on a bike or pedestrian path. Helmet: Required for every motorized foot scooter operator. Night lighting: White front lamp visible 500 feet, red rear reflector visible 600 feet. Passengers: None allowed besides the operator. Speed-limited zone cap: 5 mph on sidewalks, crosswalks and pedestrian zones.

Section 11.31.010 makes any act prohibited by Title 11 a traffic infraction, not a crime. Under Section 11.31.120, the monetary penalty for a traffic infraction cannot exceed $250 per offense unless Title 11 or state statute sets a higher figure, and the court can waive or remit it. Ignoring the notice, missing a requested hearing or not paying adds a $25.00 penalty. Section 11.46.050 also bars parents and guardians from authorizing or knowingly permitting a child or ward to break the chapter, so a parent can be held responsible for a minor's violation.

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, which shows when its source was last checked.