Did you receive a ticket from a speed camera? If yes, then Speed Camera Check is for you. The police department, city, and company have no interest in making sure the speed camera is accurate, as a matter of fact, they benefit from inaccurate readings.
Many cities mail you two pictures plus the elapsed time and the speed the camera calculated. Use those pictures and determine the distance your vehicle traveled between two landmarks in the picture. Enter the distance and time to check the accuracy of the cited speed.
This app also allows you to calculate speed and elapsed time.