Visibility range — a parameter used in road design. This is the distance at which the driver of the vehicle is able to see the space in order to stay until the collision with something on the roadway (for example, with a pedestrian at a pedestrian crossing, a vehicle or road garbage). Insufficient visibility range can adversely affect safety when driving along the highway or at the intersection. Visibility range is the distance that the car passes throughout two phases: perception (reaction time) and maneuver time. Reaction time is the time required for participants in the movement to understand the road conditions. The reaction is necessary to make a decision on which maneuver (in this case, stop the vehicle by removing the leg from the gas pedal and pressing the brake pedal). The maneuver time is the time required to complete certain operations (braking and stopping). The distance traveled by the car during the perception (reaction time) and during the completion of the necessary maneuver, and there is a range of visibility. At the same time, the braking distance directly depends on the range of visibility, as, for example, the mileage of the car affects its estimated cost during the examination. The parameter of visibility range used in the design of roads is determined by a number of emergency situations. According to the developers, this is the distance required to ensure the stop of the vehicle moving at the estimated speed. As a rule, when calculating, more time is taken to the reaction of perception and a rather low braking speed.