Boulder's Mobility & Curb Rules: The Rules That Matter

Every city handles mobility & curb rules a little differently. In Boulder, Colorado, there are 4 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Red-Light Cameras

Boulder Revised Code Section 7-4-74 authorizes the city manager to run red-light cameras at signalized intersections and camera radar for speed enforcement. A ticket based on camera evidence alone carries a flat $75 fine for running a red light and $40 for speeding under twenty-five miles per hour over the limit.

Key details: Camera radar speeding fine: $40, under 25 mph over limit. Red-light camera fine: $75 flat, Section 7-4-74(h). Authority: City manager, Section 7-4-74(a). Liable party: Registered owner, rebuttable presumption. School zone: Fines double, capped at $500.

A camera-only citation for going under twenty-five miles per hour over the limit carries a flat $40 fine under Subsection (h); a red-light violation proven solely by red-light camera image carries a flat $75 fine. Both amounts double, up to the general $500 Title 7 cap, in a posted school or construction zone under Section 7-2-4(b). Fines are prosecuted in municipal court, and the defendant may contest the citation and demand the operator's calibration testimony before conviction.

Bike Lane Rules

Boulder Revised Code Section 7-4-49 bars any gas-powered motor vehicle or low-power scooter from driving in a marked bicycle lane. Lanes signed for bicycle use still remain open to electric assisted bicycles, lightweight electric vehicles, and other human-powered vehicles alongside standard bikes.

Key details: Prohibited: Combustion vehicles, low-power scooters in bike lanes. Permitted in bike lanes: E-bikes, lightweight electric vehicles, human-powered. Citation: Boulder Revised Code 7-4-49. Default penalty: $10-$500 traffic infraction, Section 7-2-4. Related parking rule: Section 7-6-13(a)(9) bars parking in bike lane.

There is no fine written directly into Section 7-4-49, so a driving violation defaults to the Title 7 general penalty in Section 7-2-4: a traffic infraction of $10 to $500, doubled up to $500 in a posted school or construction zone. A vehicle merely parked, rather than driven, in a bike lane is cited separately under Section 7-6-13(a)(9), which bars stopping or parking in a bike lane or path.

E-Bike Classes

Boulder's code lets Class 1 and Class 2 electric assisted bicycles onto Open Space and Mountain Parks recreational paths only where the department has specifically designated and posted them for that use. Riding either class off a posted path, or riding any e-bike that doesn't meet either class definition, violates the vehicle rules in Section 8-3-6.

Key details: Class 1 speed cutoff: 20 mph, motor assists only while pedaling. Class 2 speed cutoff: 20 mph, throttle-actuated motor allowed. Motor power cap: 750 watts (Sec. 7-1-1 definition). Open space access rule: Only on paths OSMP designates and posts. Enacted by: Ordinance No. 8575 (2023).

A violation of the open space vehicle rules in Section 8-3-6 or Section 8-8-12 falls under the code's general penalty in Section 5-2-4: a fine of not more than $2,650 per violation, up to ninety days in jail, or both, unless a different penalty is set elsewhere. Park patrol officers commissioned under Section 8-3-12 can stop, identify, and cite riders found off a posted e-bike path.

Shared E-Scooter Rules

Shared scooter companies can't just show up in Boulder: Section 4-34-2 requires winning a city purchasing contract and then a license, and Section 4-34-6 caps each operator's initial fleet at 200 scooters with a two-hour rebalancing window and a $50-per-scooter financial guaranty.

Key details: License route: City purchasing contract, then city manager license. Financial guaranty: $50 per scooter, capped at $5,000. Initial fleet cap: 200 scooters per operator. Rebalance window: 2 hours after city notice. Misparking fine: $10 to $100 traffic infraction.

Operating without the Chapter 2-8 contract and Section 4-34-2 license, or exceeding the 200-scooter initial cap without city approval, puts the license at risk under Section 4-34-5, which lets the city manager suspend or revoke it for noncompliance or unpaid fines within thirty days of notice. A rider or operator who parks a scooter outside an authorized location commits a traffic infraction fined $10 to $100 under Section 4-34-8(d), and both share liability for the violation.

This is not one of those rules that cities tend to ignore. Boulder actively enforces its shared e-scooter rules requirements.

The Bottom Line

Boulder'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 Boulder is broadly strict or permissive.

All of the above reflects Boulder's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.