Why must an Aerodrome controller keep taxiing aircraft and ground vehicles outside the ILS Critical and Sensitive Areas when an arriving aircraft is on an ILS approach in low visibility?

1. Aircraft and large metal vehicles on the ground reflect and distort the VHF Localizer and UHF Glideslope radio signals, causing dangerous beam bendings, false course deviations, or autopilot pitch/roll excursions on the approaching aircraft.
2. To prevent aircraft engines from sucking in ground vehicles.
3. Because ground vehicles emit radio frequencies that jam the control tower microphones.
4. To prevent runway lights from overheating.