Have one for me too Banjo, I don't drink beer!
Bret. From the Illinois EPA website:
Idle Tests--Vehicles from model years 1968 to 1980 receive an idle test. This single-speed idle (or “static”)
test is also used for heavy duty trucks and certain passenger vehicles and light duty trucks that
can not be reasonably inspected on a dynamometer (e.g.: full-time all-wheel drive vehicles and
traction control vehicles where the traction control feature cannot be disabled).
Test notices advise motorists that the vehicle should be driven for at least 15 minutes before
testing. Preconditioning of the vehicle is very important prior to any vehicle emissions test to
ensure that all emission control components are in proper operating condition (e.g.: at proper
operating condition, the catalytic converter reaches temperatures of about 1200o F). Vehicles that initially fail a test automatically receive a second-chance test after being pre-conditioned under load on the dynamometer for about 30 seconds at 30 mph, unless the vehicle can not be reasonably driven on the dynamometer. Vehicles that cannot be pre-conditioned on the dynamometer are idled at approximately 2500 rpm for 30 seconds before another sample is taken.
(yea well...Emma didn't JUST get the idle test, but I'll remind them of that next time)
https://www.epa.state.il.us/air/vim/guide/vehicle-emissions-inspection-guide.pdf
Vehicles are driven on the dynamometer through a specific, predetermined “drive trace” that must be closely followed for accuracy and consistency.
• The standard drive trace lasts for up to four minutes.
• The total simulated driving distance is two miles.
• The maximum speed required is 56.7 mph.
• The maximum acceleration required rate is 3.3 mph per second.