In same direction mode, what does the RADAR do to the closing speed (cs) or speed of the target (ss) relative to the patrol vehicle?

In same direction mode, the radar system measures the speed of a target approaching or moving away from the patrol vehicle. When both the radar and the target are moving in the same direction, the radar calculates the closing speed by adding the speeds of both the radar unit and the target.

This process occurs because the radar measures the relative motion between the patrol vehicle and the target. If both are traveling in the same direction, the radar determines how quickly the target is closing in on the law enforcement vehicle or vice versa, which requires adding the speeds together to get an accurate measurement of the target's speed relative to the patrol vehicle. Thus, the radar sums these speeds to determine the closing speed, which is essential for enforcing speed limits and assessing the behavior of moving vehicles on the road.