Yesterday I noticed my speedometer would not return to zero right away after the vehicle had been stopped..for example, I had exited the expressway and came to a red light, and after I had stopped, the needle was barely reaching 25...20....15 and it took a good 10 seconds before it reached zero. It accurately moves up during accelaration! Does this sound like a faulty speed sensor about to call it quits?

Thanks a lot for the help