How can weather conditions affect radar speed readings?

• A. Weather conditions do not affect radar speed readings
• B. Only sunlight can interfere with readings
• C. Rain, fog, or high winds can interfere with signal transmission and accuracy
• D. Temperature changes improve radar effectiveness

Answer: (C)

Weather conditions can significantly influence radar speed readings due to their impact on signal transmission and the physical properties of the environment. Radar operates by sending out radio waves and measuring the reflections from moving vehicles. When conditions are poor, such as during rain or fog, the moisture can scatter or absorb these signals, leading to inaccuracies in speed measurements. Additionally, high winds can create turbulence in the air, which may further distort radar signals.

In contrast, factors like sunlight do not have the same level of impact on radar performance; they may affect visibility but do not directly interfere with the radar technology itself. Furthermore, temperature variations can actually impair radar effectiveness rather than improve it, as varying temperatures can alter the density of the air, affecting signal propagation. Hence, option C correctly identifies the adverse effects of various weather conditions on radar capabilities, making it the accurate choice.