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10.6.4. Uni-directional traffic
The free-exit function allows vehicles to exit a facility by automatically raising the barrier.
It is recommended that an inductive loop detector be used to activate the free-exit
facility. Infrared beams can be used for this function but a loop detector is preferred.
The free-exit loop will raise the barrier and the closing loop will be used to lower the
barrier the moment the vehicle has exited. Select the relevant direction on the control
card within the loop detector menu, refer to Section 7.
10.6.5. Bi-directional traffic
This allows access for traffic from both directions in a single lane. In this case the same
barrier provides access control for vehicles entering and free-exit for vehicles exiting.
A triggering device can be used for the access function and the loop for the free-exit
function.
The free-exit loop must be mounted close enough to the closing loop so that the vehicle
exiting is still present on this loop when it reaches the closing loop. However, these must
not be too close together (a distance greater than 1000mm is required), or magnetic
interference will be caused.
The free-exit loop will raise the barrier and the closing loop will be used to lower the
barrier the moment the vehicle has exited. Select the relevant direction on the control
card within the Loop Detector Menu refer to Section 7.
APPENDICES
SECTION 10
Summary of Contents for SECTOR II
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