The Potential Personal Injury Litigation Consequences of California AB 544

California’s AB 544, effective January 1, 2026, mandates that all e-bikes be equipped with either a rear red reflector or a red taillight with a built-in reflector that is visible from 500 feet.  This requirement applies at all times – i.e. at all times of the day and during all visibility conditions. The statute sets a uniform visibility standard that will likely become a focal point in e-bike accident investigations and litigation in the future.

The policy behind AB 544 is straightforward: rear visibility reduces rear-end and overtaking collisions by improving a rider’s detectability to motorists and other roadway users. A constant, standardized visibility feature simplifies enforcement and it minimizes ambiguity about when reflectors or lights must be used.

For manufacturers and retailers, AB 544 introduces potential exposure under product liability and consumer protection theories if e-bikes are sold in California without compliant equipment or adequate instructions for use and maintenance of the required reflector/taillight. Manufacturers may face design defect or failure-to-warn claims if the product as sold cannot meet the 500-foot visibility standard, if the reflector is easily obscured or dislodged under normal use, or if instructions omit inspection and replacement guidance. Retailers could face claims for selling noncompliant units, for negligent installation of lighting components, or for failing to advise consumers of the “at all times” requirement.

In collision cases, AB 544 may affect both liability and damages analyses. For plaintiffs injured in e-bike crashes, proof that the e-bike was equipped with a compliant rear reflector or taillight and that it was visible from 500 feet can support arguments against comparative fault related to conspicuity.

People involved in e-bike injury accidents should contact Mastagni Holstedt for consultation.