Final answer:
BOLO is the acronym recommended for telecommunicators to describe vehicles, which means 'Be On the Look Out'.
Step-by-step explanation:
The acronym recommended to assist telecommunicators when getting a description of vehicles is BOLO. BOLO stands for 'Be On the Look Out' and is used by law enforcement to alert personnel to watch for a specific person, vehicle, or item that is connected to a crime or incident. When a telecommunicator is collecting details, using this acronym helps to communicate the description effectively to officers or other emergency service personnel.