Interesting to note that a Fire Engine was damaged in Manchester, due to the bollards rising while passing over them. Apparently two fire engines were attempting to pass through them, it recognised the sensor of the first, but not of the second unit causing considerable damage, and putting it out of action for several weeks.
I assume then, that the bollards have to go full cycle, dropping and rising, before sensing a second vehicle. In that case, what if there were a major incident inside a "bollard zone", requiring a considerable number of emergency vehicles! Valuable time could be wasted, while each vehicle has to wait before passing through.
Usually with a barrier, if it starts to drop as a second vehicle starts to go through, it immediately rises again.
I noticed a bus stuck by the bollards in Bartholomew Street today, and then being towed away by a wrecker. Had it hit the bollards, or just broken down at an inconvenient spot? |
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