NYS emisions dyno testing, and ABS

Factual Questions
1

in NYS, well actually the greater NYC area, cars (FWD and RWD) are required to go through a dyno test simulating a drive someone might do (well from the looks of it no one would ever drive that way), and measuring the emisions.

During this test the drive wheels are on rollers while the non-drive wheels are on pavement not turning.

Recently I had a reart brake lock up while sitting over night, as I came down my icy driveway that wheel would not turn, once pavement was hit it started, but the lenght of the driveway was enought to turn on the ABS light, which I assume was because the ABS computer did not receive a signal from one sensor.

Now wouldn’t the dyno test do the same thing, just the ABS computer would not see the signal from 2 sensors?

2

When the wheels are stopped, the ABS doesn’t go ahead and allow them to roll. Ergo: the wheels are placed on the dyno, the non-drive wheels are motionless, and the test proceeds.

If the wheels were rolling and the tester didn’t get the car motionless, then the ABS would conclude the car was rolling. But the test starts with the car motionless.

Only cars with active traction control would be a problem, but these cars allow the traction control to be switched off. Traction control = no wheel is going to spin under my watch. Can’t do any burnouts with it on (like the test sims), but it can be defeated in all cars because of various situations where you need to spin the wheels.