boom barrier
Pivoting access bar
A boom barrier is a horizontal bar that pivots to block or allow vehicle access—the familiar arm at parking garages, toll plazas, and railway crossings.
The bar swings up or retracts to let vehicles through, then lowers to block passage.
Also called a boom gate.
Shape's outer edge length
- surveillanceSystematic observation of subjects
- guardWatchful defensive attention
- CCTVSurveillance camera network
- restrictedLimited in scope
access control · deterrent · patrol · intrusion · fortification · compound · facility · lockdown
Hinged barrier in fence
- crossingPoint where paths intersect
- borderOuter edge or limit
- customsTraditional practices or import taxes
- inspectionFormal assessment of condition
immigration · passport · control · frontier · quarantine · patrol · screening · entry
Large amount or portion
- garageEnclosed vehicle storage structure
- entrancePoint of access
- exitWay to leave
- ticketEntry permit slip
attendant · permit · carpark · meter · stall · reserved · validation · gantry
Road fee collection point
transponder · highway · interchange · collection · lane · cashier · payment · automatic
perimeter
Shape's outer edge length
- surveillanceSystematic observation of subjects
- guardWatchful defensive attention
- CCTVSurveillance camera network
restricted · access control · deterrent · patrol · intrusion · fortification · compound · facility · lockdown · sentry
gate
Hinged barrier in fence
- crossingPoint where paths intersect
- borderOuter edge or limit
- customsTraditional practices or import taxes
inspection · immigration · passport · control · frontier · quarantine · patrol · screening · entry · exit
lot
Large amount or portion
ticket · attendant · permit · carpark · meter · stall · reserved · validation · gantry · ramp
tollbooth
Road fee collection point
fare · transponder · highway · interchange · collection · lane · cashier · payment · automatic · electronic
arm
Upper body limb
- counterweightBalancing mass in machinery
- pivotPoint of rotation
- motorEnergy-to-motion converter
reflective · striped · pole · lifting · lowering · sensor · automatic · manual · operator · lever
boom barriersliding gate
Laterally opening barrier
swing gate · turnstile · bollard · portcullis · drawbridge