carriageline
Established Member
- Joined
- 11 Jan 2012
- Messages
- 1,897
Seems some confusion over how OD barriers work.
From what I was told by the commissioning staff, the following happens:
Once the sequence is started, the area is scanned for obstructions.
If clear, then whilst (or after, can't remember now!) the facing barriers are down/lowering it is again swept for obstructions.
Once all 4 barriers are detected down, it is swept once more for confirmation the crossing is clear.
Once the OD has scanned and confirmed clear, "crossing clear" is given to the interlocking, and signals are able to be cleared.
If an obstacle is detected, then the facing barriers will raise to release the obstacle (this will happen twice if the obstacle is still there after). If the obstacle is still there after 2 raises, all 4 barriers will raise and the signaller will get an "obstacle detected" fault, and the crossing will drop out of auto.
There is CCTV at OD crossings, (provided on the back of the wigwags) and is available by dialling into an IP address using software/webpage, but I don't believe that has been approved for use yet.
Note: these are how ODs I control work, I presume it's all similar!
From what I was told by the commissioning staff, the following happens:
Once the sequence is started, the area is scanned for obstructions.
If clear, then whilst (or after, can't remember now!) the facing barriers are down/lowering it is again swept for obstructions.
Once all 4 barriers are detected down, it is swept once more for confirmation the crossing is clear.
Once the OD has scanned and confirmed clear, "crossing clear" is given to the interlocking, and signals are able to be cleared.
If an obstacle is detected, then the facing barriers will raise to release the obstacle (this will happen twice if the obstacle is still there after). If the obstacle is still there after 2 raises, all 4 barriers will raise and the signaller will get an "obstacle detected" fault, and the crossing will drop out of auto.
I was under the impression that this crossing concerned was in a MCB-OD and not a MCB-CCTV so there are no cameras there except the ANPR cameras and the proof of flashing red cameras. Which you can just make out on the trailing barriers light clusters.
There is CCTV at OD crossings, (provided on the back of the wigwags) and is available by dialling into an IP address using software/webpage, but I don't believe that has been approved for use yet.
Note: these are how ODs I control work, I presume it's all similar!
Last edited: