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Forum: Brainstorming Topic: How to markedly reduce congestion |
| ICEAFE |
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Posted: Wed Aug 01, 2007 11:15
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Replies: 23
Views: 22717
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| Fascinating! Yes - an over simplification; but easy to remember. However if I have correctly interpreted the definition of Slip (S) then we have 60% of the rolling frictional coefficient for wet asphalt, which not too far out. Perhaps you could confirm or explain. I am however surprised at the resul... |
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Forum: Brainstorming Topic: How to markedly reduce congestion |
| ICEAFE |
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Posted: Tue Jul 31, 2007 22:28
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Replies: 23
Views: 22717
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| Yes - The coeffient of slipping friction is half that of rolling friction. That is why we have ABS and why we older drivers were taught to apply brakes intermittantly rather than just slamming them on. |
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Forum: Brainstorming Topic: How to markedly reduce congestion |
| ICEAFE |
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Posted: Tue Jul 31, 2007 19:42
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Replies: 23
Views: 22717
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| The main problem with Chevrons is that they are not speed sensitive. A 2 sec gap at 70 mph is, to say the least, slightly different to one at 20 mph. I suspect they are set for an average speed of 60 mph. Also they are infrequent on motorways and only cover short distances thank goodness as they giv... |
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Forum: Brainstorming Topic: How to markedly reduce congestion |
| ICEAFE |
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Posted: Mon Jul 30, 2007 20:48
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Replies: 23
Views: 22717
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| Bottyburp has made a very valid observation here. These studs should not cause problems with motor cycles. Any suggestions anyone? I back off Bottyburp!!!. I am only trying to keep this all lighthearted. I sold my 500 cc side vv Norton in about 1952 when I concluded that the combination of my arroga... |
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Forum: Improving Road Safety Topic: Tailgating |
| ICEAFE |
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Posted: Sat Jul 28, 2007 20:46
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Replies: 91
Views: 72304
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| RobinXe is right the car's speed should be controlled using the interplay between gears, neutral, momentum and road gradient. The brakes are only there for fine trimming and of course emergencies. At my last MOT the brake pads were still good after 60.000 miles. However if you drive close behind you... |
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Forum: Brainstorming Topic: How to markedly reduce congestion |
| ICEAFE |
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Posted: Sat Jul 28, 2007 10:09
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Replies: 23
Views: 22717
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| Yes Bottyburp - We must not exclude our lethal colleagues must we? In spite of our envy. |
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Forum: Brainstorming Topic: How to markedly reduce congestion |
| ICEAFE |
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Posted: Fri Jul 27, 2007 17:12
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Replies: 23
Views: 22717
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| Yes - Semitone is right. The mathematics is a bit complex and is down to Mr. Poisson that renowned mathematician with his queing theory which relates the probability of a queue forming against a function of the ratio between the arrival and the departure rates I won't go into details here but if you... |
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Forum: Brainstorming Topic: How to markedly reduce congestion |
| ICEAFE |
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Posted: Fri Jul 27, 2007 10:45
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Replies: 23
Views: 22717
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| Some good responses 1) Malcolmw - "What forces you back?" - Mainly Intelligence. All the ICE is doing is informing you that if you drive in the red sector then you will very likely have to slow down or stop at some point downstream. If, however you stay in the green sector then the likelho... |
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Forum: Brainstorming Topic: How to markedly reduce congestion |
| ICEAFE |
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Posted: Thu Jul 26, 2007 21:10
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Replies: 23
Views: 22717
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| This idea/concept is not for the faint hearted. It requires a degree of numeracy in matters of probability, statistics and mean values to appreciate the subtleties of the invention. So please move on if you find these matters boring. But before you do please note that this device will substantially ... |
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Forum: Improving Road Safety Topic: Tailgating |
| ICEAFE |
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Posted: Thu Jul 26, 2007 12:13
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Replies: 91
Views: 72304
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| Thoroughly agree with that. Many is the time I have had my foot on the brake slowing down well before the brake lights of the cars ahead start showing. Sometimes I find it quite frightening how myopic some drivers can be. |
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Forum: Improving Road Safety Topic: Tailgating |
| ICEAFE |
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Posted: Wed Jul 25, 2007 22:10
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Replies: 91
Views: 72304
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| No - I have no advanced driver qualifications. I'm just a 72 yr old marine engineer with latterly 5 yrs experience as a private hire taxi driver, now retired. However I have spent this time studying tailgating and it's effect on traffic perturbations and have arrived at some interesting conclusions.... |
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Forum: Improving Road Safety Topic: Tailgating |
| ICEAFE |
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Posted: Wed Jul 25, 2007 10:25
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Replies: 91
Views: 72304
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OK - enough said and all a bit pedantic. I assume that neither of us has yet been involved in a shunt so what are we getting bothered about? Cheers  |
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Forum: Improving Road Safety Topic: Tailgating |
| ICEAFE |
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Posted: Wed Jul 25, 2007 09:54
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Replies: 91
Views: 72304
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| Sorry Safespeed but I will stick to my guns. The 2 second recommendation is based on the 0.68 sec think time and the balance of 1.32 secs comes from s= ut + 1/2a t [squared] where s is the stopping distance, t is time and a is the deceleration rate. I do agree that in a two car situation you can dri... |
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Forum: Improving Road Safety Topic: Tailgating |
| ICEAFE |
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Posted: Tue Jul 24, 2007 09:25
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Replies: 91
Views: 72304
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| Yes - 2 seconds may well be appropriate at lower speeds and traffic densities; but it should realised that the risk factor rises exponentially as the TBV is reduced. Also tiredness, boredom and stress should be taken into account which at times would make 4 seconds a better option. You take your pic... |
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Forum: Improving Road Safety Topic: Tailgating |
| ICEAFE |
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Posted: Mon Jul 23, 2007 10:41
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Replies: 91
Views: 72304
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| Tailgating is easily defined as "Time interval between vehicles". The Highway Code defines the safe distance between vehicles in tabular form as stopping distances for various speeds. These can be converted to "TBVs" [Time between vehicles] using a 21.5 ft/second squared decelera... |
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