street cleaner

i’ve noticed that a lot of the push along street cleaners now have seat attachments. here was one seemingly abandoned in the street. i looked at the dials to see if it had a maximum speed, but none of the dials showed velocity (only fuel and time !).
Maybe there is a distance measurer somewhere and the driver has to do his own velocity = distance/time calculations. Those guys who clean the street – they are all secret rocket scientists. perhaps.