Video clocks are electronic clocks that display time as a verified measurement quantity within a video sequence of the current traffic situation. Time difference can be determined from that time information in the video frames; these differences can be used in a variety of applications in traffic control settings.
A typical deployment scenario of video clocks is the determination of the average velocity of vehicles. Using the times displayed in individual video frames showing a vehicle passing each of two lines separated by a known distance (e.g., 50 m) one can calculate the speed of this vehicle. For this to work reliable the camera has to be set up such that the lines, for instance white markings on the road surface, can be seen in the video frames in an unobstructed way.
List of approved devices (as of July 2016):
| Manufacturer | Adress | Type designation/ Type approval mark |
 DAKO EDV-Ingenieur- und Systemhaus GmbH | Ernst-Haeckel-Platz 5/6 07745 Jena | DAKO Timer 1 19.02 / 04.01 |
| DAKO EDV-Ingenieur- und Systemhaus GmbH | Ernst-Haeckel-Platz 5/6 07745 Jena | DAKO Timer 2 LAN 19.02 / 08.01 |
| Video Service Piller | Mondscheinweg 3 80997 München | CG – P 50 E 18.13 / 88.04 |
| Deininger Elektronik GmbH & Co. KG | Rudolf-Diesel-Straße 4 76356 Weingarten (Baden) | VSTP 18.13 / 92.05 |