Just had the truck worked on and tried to go thru Marta inspection and it failed - they said there is a drive cycle that I need to go thru before it will pass - what is the drive cycle

Drive cycles vary by manufacturer. It can be as simple as driving at highways speeds for a certain number of miles, or it can bea number of times the vehicle is started and warmed up, then turned off to cool down. A new car dealership service department may be able to tell you what the drive cycle is for your particular vehicle. Anytime you clear the computer on your vehicle, either by using a scanner, or removing power from the computer, you must go through the designated number of drive cycles to reset the computer diagnostics. It's a lousy system, and the auto industry should be required to conform to some kind of standard for all vehicles, regardless of make and model. But, for now, it's not clear exactly what you need to do to achieve the required drive cycles. If your inspection has expired, keep the documents you received when your vehicle failed the last test, just in case you get pulled over by the police.