OBS recording software, web browser source: https://archive.org/details/arcade_nitedrvr

We record video of the gameplay and then we take screenshots from the video.  

Finally, we do calculations using data from the screenshots.  

Recording #1

odometer 005, time 091, speed 065
odometer 065, time 048, speed 065
60 odometer turns / 43 seconds = 1.40 odometer turns/sec  

Yes, a speed of 65 is equal to 65 times the unit speed.  

Recording #2

Recording #2
odometer 010, time 089, speed 100
odometer 205, time 000, speed 100
195 odometer turns / 89 seconds = 2.191 = 2.2 odometer turns/sec

Yes, a speed of 100 is equal to 100 times the unit speed.  

It would seem that any allowed speed in this game will be a multiple of the unit speed.  That is, any speed n will be equal to n times the unit speed.  

If further work would be done, we could predict the maximum speed of 200 in Novice mode will be 200 times the unit speed.  That is, 200 * 0.022 = 4.4 odometer turns per second.  

In the next blog entry, we will begin making measurements of the acceleration of the car in all four gears, plus the deceleration of the car when you release the accelerator.