Final answer:
Vehicle movements without ATC clearance are typically allowed in uncontrolled airspace and on the ground at non-towered airports following local airport guidelines.
Step-by-step explanation:
Vehicle movements are permitted without clearance from Air Traffic Control (ATC) in areas that are not controlled by ATC, which are typically referred to as uncontrolled airspace. In these areas, pilots are expected to operate their aircraft using see-and-avoid procedures and to follow Visual Flight Rules (VFR). For example, at some small airports without a control tower, pilots communicate with one another on a common frequency and coordinate their own takeoffs and landings without involvement from ATC. Moreover, when an aircraft is on the ground at a non-towered airport, or in certain parts of airports where ATC does not exercise jurisdiction, drivers of ground vehicles can generally move without ATC clearances. However, these drivers are bound by airport rules, regulations, and any local procedures, which might include communication on specific frequencies to avoid conflicts. It is crucial to review and understand local airport guidelines before operating a vehicle in these areas.
Complete question:
In what areas are vehicle movements permitted without clearance from ATC?