Which speed detection method can provide more precise speed measurements in adverse weather?

Lidar, which stands for Light Detection and Ranging, is particularly effective in providing precise speed measurements, especially in adverse weather conditions. This method utilizes laser technology to measure the speed of vehicles with a high degree of accuracy. Unlike radar, which can be influenced by the presence of precipitation or other atmospheric phenomena, Lidar can function effectively in conditions such as rain, fog, or snow.

Lidar systems send out rapid pulses of laser light towards a target and calculate the travel time of those pulses to determine distance and speed. Its narrow beam allows for more selective targeting of individual vehicles, which can further improve measurement accuracy. The technology's precision remains relatively unaffected by environmental factors, contributing to reliable speed detection even when visibility is compromised.

In contrast, radar might experience signal scattering or interference in heavy rain or snow due to its reliance on radio waves. Speed cameras, while effective in general conditions, may be less precise in dynamic weather situations. Acoustic sensors, which use sound waves to detect speed, can also be affected by weather elements that disrupt sound transmission. Thus, Lidar stands out as the superior choice for accurate speed measurements in adverse weather conditions.