exhaust testers on side of road???

[DarkHelmet22]

have any of you seen or heard about the things on the side of the road that test your exhaust? Some people have told me about them but I have yet to see one.

Alex

 

[torquefreak]

I've seen some before in the N. Dallas area getting on the ramp to East Bound 635 at Plano Rd. Basically a truck w/ some type of meter outside , with cones and signs everywhere!!

 

[coleman]

I think they are just gathering statistics on exhaust gas ... not like they send cops after you if you are running poorly.

I've seen then in North Dallas as well ... where torquefreak mentions and forest lane on-ramp to south-bound 75.