Which type of radar measures speeds of vehicles traveling in the same direction?

The correct answer is the type of radar that measures the speeds of vehicles traveling in the same direction, which is known as "same direction moving radar." This type of radar is specifically designed to track vehicles that are moving alongside the radar unit, allowing it to measure the relative speed between the radar and the target vehicle.

In contrast, stationary radar typically measures speeds of vehicles approaching or departing from the radar source and is fixed in one location. Moving radar refers to equipment that can measure the speed of vehicles while it itself is in motion, but it primarily operates by measuring speeds of vehicles moving toward or away from it, rather than specifically tracking those in the same direction. Opposite direction moving radar is optimized for capturing speeds of vehicles heading towards the radar rather than parallel movements.

Therefore, only same direction moving radar provides the capability to effectively measure speeds of vehicles traveling alongside it, ensuring accurate readings under those conditions.