Which of the following is NOT a type of speed measurement device?

The reasoning for identifying speedometers as not typically classified in the context of specialized speed measurement devices like those mentioned in the other options is rooted in their primary function and context of use. Speedometers are standard instruments found in most vehicles and are primarily designed to indicate the speed of the vehicle in real-time rather than serve as enforcement tools for measuring the speed of other vehicles in traffic.

In contrast, VASCAR (Visual Average Speed Computer And Recorder), Lidar (Light Detection and Ranging), and Radar (Radio Detection and Ranging) are specific technologies that have been developed and are used specifically for the observation and enforcement of speed limits. VASCAR calculates speed based on the time taken to travel between two points, while Lidar and Radar are sophisticated devices that use light and radio waves, respectively, to detect and record the speed of vehicles over distances.

Thus, in the context of the question, speedometers do not fit into the category of specialized speed measurement technologies used for traffic enforcement, making them the correct choice for the item that does not belong.