CASE STUDY
Industrial Building: Single-Lane Two-Way Traffic with Octopus Payment
The original barriers were retained, with ANPR, LED displays and traffic lights added to resolve head-on conflicts on a narrow lane.
Industrial building in Kwun Tong (client name withheld under confidentiality arrangement)
Background
The building has a single lane under twenty metres long that must serve both entry and exit. Traffic was previously coordinated by guards by eye, and head-on standoffs were common at busy times; reversing trucks frequently struck the barrier arms. The owner did not want major structural changes and preferred an equipment-based solution.
Design
The existing barrier arms and motors were retained. We added an ANPR camera, an LED display and a pair of traffic lights, with inductive ground loops determining vehicle position. Once an entering vehicle is identified, the exit direction shows red; when the vehicle tail clears the loop, the system returns to two-way standby. Hourly parkers pay by Octopus before exiting, while monthly parkers pass directly.
Challenges
The lane is short and steeply inclined, so plates distort easily in the frame, and strong side sunlight hits the lane during the day. We mounted the camera higher ahead of the barrier, fitted a sun hood and supplementary lighting, and used two-stage triggering (loop plus image) to avoid misreads. Commissioning was carried out with real trucks, vans and private cars, each tested repeatedly.
Result
Head-on conflicts dropped substantially, as did the number of times barrier arms were struck. Guards no longer need to stand in the middle of the lane for long periods and can cover other posts. The system retains a manual release button, and the barrier arm can be raised by hand during power failure. Deliverables included lane test records, a tariff rules table and a fallback release procedure.
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