Anything that brings the car to a complete stop? Such as the brakes or a Tree?
Could be your speed sensor on your transmission
You may need to replace the speedometer fuse. The speedometer cable can cause your speedometer to stop working. The speed sensor can also cause the speedometer to stop working.
My 89Chevrolet astro van digital speedometer stop working. How do I fix it
why would a speedometer stop working on a Mazda
you can go to speedometer and out of speedometer
The gear between the driveshaft and the transmission is broke you need a knew one
In my personal experience the speedometer stopped working because the mechanical drive cable broke.
Sounds like the speedometer cable broke.
coming to a complete stop
A blown fuse can cause your fuel gauge and speedometer to stop working. Replace the fuse. The fuse can be found in the fuse box. The location of the fuse will be listed on the inside cover of the fuse box.
Most likely the VSS. Vehicle Speed Sensor. It is mounted on the side of the transmission.
Broken speedometer cable.