Runnertogo, look up cosine effect for traffic radar. That cop catches someone going let’s say 70, with a steep angle like you mention, the driver is actually traveling faster. He gets a break if the radar showed 70, he was actually going faster.

As for accuracy, traffic radar is accurate. As long as the operator is trained and uses it correctly.

Traffic radar class - you spend more time in class learning all the anomalies and how to prevent them.