I am interested in modeling vehicles idling. Would modeling their speed limit at 1 mph accomplish this and be an accurate representation?
This could work in some cases, but you need to think about why /under what condition you are modeling. Remember that TNM is set to model a constant flow line source. Idling vehicles are more of a stationary point/area source if they are stationary for a long period. If you want to include the effects of stopped vehicles at a signal or some similar source, they would produce an insignificant portion of the total noise, which would be dominated by acceleration away from the light. It is recommended that users work this type of problem out with paper and pen instead.
