What is a Frontage Road (Yan Yol) in Turkey? A frontage road, known locally as a 'yan yol' or 'servis yolu', is a specialized traffic lane designed to run parallel to a major highway or expressway. Its primary purpose is to collect and distribute traffic to and from local properties, commercial areas, and minor streets without causing disruptions on the main high-speed corridor. This structural separation prevents dangerous stop-and-go conditions on the motorway, maintaining smooth traffic flow and lowering the risk of severe rear-end collisions. ## Speed Limits and Traffic Dynamics on Parallel Service Roads Because frontage roads cater to local destinations, public bus stops, and even pedestrians, their traffic dynamics differ vastly from those of the main highway. Speed limits are significantly lower, and drivers must quickly adapt their driving style when transitioning between the high-speed expressway and the low-speed frontage road. Failing to reduce speed adequately when exiting the highway is a frequent mistake that can lead to loss of vehicle control or collisions with slower-moving local traffic. ## Key Priority and Merging Rules for the Turkish Theory Exam For the Turkish MTSK theory exam, understanding right-of-way rules at connection points is essential. When exiting a main highway onto a frontage road, you must utilize the deceleration lane to reduce your speed before entering the local flow. Conversely, when merging from a 'yan yol' onto the main highway, you must use the acceleration lane to match the speed of highway traffic, check your blind spots, and yield to all vehicles already traveling on the highway before safely merging. ## Common Driving Hazards on a Servis Yolu Drivers must remain highly alert on a frontage road due to several unique hazards. These roads often feature frequent entry and exit points, slow-moving commercial delivery vehicles, local public transport like dolmuş and municipal buses, and unexpected pedestrians. Maintaining a safe following distance and scanning the road ahead for merging vehicles are key practices for preventing accidents in these complex environments.