| General > General Technical Chat |
| Laservision stop signs in Sydney road tunnels |
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| Bud:
--- Quote from: Cubdriver on August 20, 2021, 03:17:33 pm --- --- Quote from: retiredfeline on August 19, 2021, 10:31:56 am ---I liked the irony of the phrase on the back door: (Attachment Link) --- End quote --- "On the road to success there are no shortcuts" ...but there are ARE low underpasses... -Pat --- End quote --- I once saw on the road a tow truck pulling a wrecked Volkswagen Beetle, which had a painted logo on it that read " Lucky Bug Driving School". Yeah, I thought, how symbolic... hoping the student and instructor were OK. ??? |
| Halcyon:
--- Quote from: Rick Law on August 21, 2021, 04:31:49 am --- --- Quote from: thinkfat on August 20, 2021, 10:08:42 am ---... Adding a narrow S curve designed to be impassable for trucks over a certain width and length might be good as well. --- End quote --- What is added and how they are added often is left to civil engineers. What does surprise me is that they are not using as much modern electronics as they can. Height-limit should be rather easy to verify. Erect a couple of poles with photo censors on one and laser source on the other - determine if the beams are cut, than a sign "Height limit exceeded" with a whole line of blinking red lights should be rather easy to do. May be there are certain limitation/difficulty I am not seeing. Weight-limit is more difficult. Detecting weight would require adding different number of axles for the total. Deciding which axles is the first and which is the last from the same vehicle would be a more challenging tasks. --- End quote --- What you describe with the height sensors is exactly what happens here. They start several kilometres before the tunnel to give over-height vehicles an opportunity to take then exit(s) before the tunnel. Weight is determined by vehicle class so it's relatively easy to determine the maximum (legal) mass of a vehicle just by looking at it. This is unless of course the vehicle is over-laden which attracts severe penalities in itself. Heavy vehicles are randomly inspected and weighed along major arterial roads in Australia and failing to stop for these inspection is also an offence. |
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