Construction zones fundamentally alter the normal flow of traffic and create numerous hazards that endanger cyclists. One of the most common causes of bicycle accidents in these areas is lane narrowing. When construction reduces the available road width, drivers are forced closer to cyclists, leaving little room for error. Many drivers fail to provide the legally required three-foot passing distance mandated by California Vehicle Code Section 21760, resulting in sideswipe collisions or forcing cyclists off the road into construction barriers or debris.
Poor signage and inadequate warnings also contribute significantly to construction zone bicycle accidents. When work zones lack proper advance warning signs, cyclists may suddenly encounter unexpected hazards without sufficient time to react. Missing or confusing detour signs can lead cyclists into dangerous situations, such as high-speed traffic lanes or areas with heavy construction equipment. Additionally, faded lane markings in construction zones can cause confusion for both drivers and cyclists about where they should position themselves on the roadway.
Uneven pavement and road debris present another major hazard. Construction zones frequently feature sudden changes in road surface elevation, loose gravel, metal plates covering excavations, and various construction materials that can cause a cyclist to lose control. Unlike motor vehicles, bicycles are extremely vulnerable to these surface irregularities. A pothole or debris pile that a car might easily navigate can send a cyclist tumbling to the ground, often directly into the path of traffic. Construction companies and contractors have a legal duty to maintain reasonably safe conditions for all road users, including cyclists, and failure to do so can constitute negligence.