Joined: Mar 2015 Posts: 5,205 Threads: 223
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Location: Scotchland
They are very much treasured, Colin.
Joined: Aug 2017 Posts: 887 Threads: 71
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9
Location: Essex
Having bought a Drummond round bed I decided to have a lesson with the father of a friend of ours on how to avoid losing an eye.
We took two steering wheel bosses and turned the splined centre from one then the other... a little welding and I'll have a nice boss for a wood rimmed wheel for the Silverstone splined correctly for a Ruby column.
Joined: Oct 2017 Posts: 1,398 Threads: 45
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8
I knew if I looked I'd find the answer, here are two contractors comments: "If automobile traffic is your main consideration, bollard spacing should be no more than five feet apart. Even the smallest automobiles available will be prevented from entering at this spacing. If fork lift or other industrial vehicles are the vehicles to be denied access, consider the width of the thinnest vehicle to be stopped and ensure that your bollard spacing is tighter than that vehicles’ width.
They can be installed close to the curb if there is no vehicle parking allowed. they can be installed close to the curb. The distance between bollards should be between 3 and 5 feet, enough to allow for pedestrian traffic and wheelchair access, but close enough to deter the entrance of a vehicle."
Whilst the DOT is a bit more precise: "D.O.T. CPNI (Centre for the Protection of National Infrastructure)
Traffic Advisory Leaflet 02/13 May 2013 (as amended October 2017)
Bollards and Pedestrian Movement
To meet security requirements, bollards must be positioned to maximise blast stand-off distance, and spaced at a maximum air gap (between bollards) of 1,200mm. Additional considerations include meeting objectives for health and safety, site operation, cost and aesthetics. 47,24”
I don'y know what they mean by blast stand off, obviously if they follow the DOT specification they will use more bollards putting the price up so 5' appears to the general gap and they haven't heard of Austin Sevens.
Joined: Aug 2017 Posts: 1,535 Threads: 90
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Location: Monmouthshire
Blast stand off is in case you had a rush of madness at the weekend and dropped a Cirrus into your Seven special.
Joined: Aug 2017 Posts: 2,257 Threads: 33
Reputation:
35
Location: Deepest Frogland 30960
Car type: 1933 RP Standard Saloon
Street furniture is usually placed at 450mm (18") from kerb edge to avoid conflicts with passing traffic. This also applies to the outer dimension of a street sign so they don't get clouted by LGV/Bus mirrors. Minimum headroom height of signs is usually 2.1metres, if installed on a footway.
Blast stand-off distance is a term I've never heard of in over 10 years of Traffic Management.