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Old February 20th, 2009, 06:12 PM   #221
deranged
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I agree with most of what's been posted so far - the rules may be explicit, but in reality it is context-specific, and both sides have a case.

EDIT: I wrote nonsense, so I deleted it.

Last edited by deranged; February 21st, 2009 at 10:26 AM.
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Old February 20th, 2009, 06:57 PM   #222
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Quote:
Originally Posted by deranged View Post
First, if one vehicle is slightly in front of the other, the vehicle in front should have priority
What about if the front of one's vehicle is slightly in front of the other's, but its back is behind the other's back?
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Old February 20th, 2009, 07:25 PM   #223
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(EDIT: I wrote nonsense, so I deleted it.)

But working out priorities in that situation is a walk in the park compared to this (thanks Sniper)...


Last edited by deranged; February 21st, 2009 at 10:25 AM.
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Old February 20th, 2009, 07:33 PM   #224
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That problem is mainly because people see it's jammed at an intersection, but still enter the intersection and find themselves not able to continue, hence blocking the intersection for other traffic.

There should be a law that entering a jammed intersection should be forbidden even if the light's on green.
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Old February 20th, 2009, 07:46 PM   #225
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^ We have such law; I suspect other countries too. What a mess on the photo.
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Old February 20th, 2009, 07:51 PM   #226
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@ Chris:

I know; I just posted that pic because I love it

Yes, obviously entering a blocked intersection should be illegal, and I think in most countries it already is.

But the issue of clearing the intersection in that photo once the damage has been done, isn't a simple task. From the pic, it appears that trickles of traffic are getting through by creating space the width of 1-2 vehicles in each direction.

To clear the intersection quickly, the vehicles going towards the top-left are in the best (read: only) position to sacrifice by turning right and allowing top-right-bound traffic through, and subsequently the others, to alleviate the gridlock. The problem is that just wouldn't happen without direct orders from traffic officers.

(Apologies for the off-topic)

Last edited by deranged; February 21st, 2009 at 03:16 AM.
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Old February 20th, 2009, 11:54 PM   #227
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Isn't that gridlocked intersection a perfect example of prisoner's dillema?
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Old February 21st, 2009, 03:51 AM   #228
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I see a yellow box in that intersection. In the UK that means that you should not enter the box if other traffic is stationary in it. Retards here obviously don't read their highway code handbook enough.
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Old February 21st, 2009, 09:50 AM   #229
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In what country was this pic actually taken? Brazil or somewhere else in South America?
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Old February 21st, 2009, 10:06 AM   #230
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Correct! Specifically, Sao Paulo, according to Sniper.

Back to the original situation - IMHO, this is what should happen in practice:

Right-of-way:

The vehicle in the slow lane should change first if:
- the situation is near an on-ramp (to let merging traffic enter the mainline easily), or
- it is overtaking a very slow vehicle.

Otherwise, the vehicle in the fast lane should change first
(because the fast lane can then be used by faster vehicles, and the slow lane vehicle is attempting an unnecessary lane change.)

Emergency situations:

If both vehicles have already begun moving into the same lane and one vehicle is slightly in front of the other, the vehicle behind should yield in order to avoid an accident, as it has better visibility.

Last edited by deranged; February 21st, 2009 at 10:31 AM.
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Old April 23rd, 2009, 06:26 PM   #231
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Safest / most efficient motorway speed?

A couple of folks have mentioned in 3 different threads that 'numerous reports indicate that the safest and/or most efficient speed is 80/90kmh.' Does anyone have references to any of these reports? Links?

Thanks,
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Old April 23rd, 2009, 06:54 PM   #232
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http://en.wikipedia.org/wiki/Fuel_ec...in_automobiles

While they advertise with the best speed to reach a certain fuel economy, it's in my opinion more important if you can reach a constant speed. Going from 0 - 80 km/h all the time on main roads through villages is less fuel efficient than doing 120 km/h on a freeflowing freeway.

I always monitor the fuel consumption of my car, and I got these standards over the past 6 months;

urban (0 - 70 km/h): 16 km / l
urban/main roads 0 - 90 km/h): 17 km / l
freeway (100 - 120 km/h): 19 km / l
main roads (90 - 100 km/h) : 20 km / l

I have to note I drive a diesel car. It would be different with petrol or hybrids.
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Old April 23rd, 2009, 06:55 PM   #233
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Argh.. Not these km / l again


What is safe? Safe is when you sit at home sipping beer

Most efficient(biggest capacity) is at 90 km/h.
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Old April 23rd, 2009, 06:55 PM   #234
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safest speed is ZERO... (and to be in a concrete bunker... )

efficiency means the vehicle/lane/hour value, which is highest at 80-90km/h...

at higher speeds the following distance increases more than the speed...
(and vice versa: at lower speed the following distance dont decreases as much as the speed)



EDIT: 3 replies within a minute...
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Old April 23rd, 2009, 06:57 PM   #235
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You can speak of generally three things when it comes to speed.

=> roadway capacity
=> traffic safety
=> fuel economy

For the first one, the most optimum capacity is around 90 - 100 km/h, but I do not have a link right now, but that's what I hear the most in the business. The second one varies more by roadway design, than by speed, doing 80 km/h on a road with traffic in two directions is significantly unsafer than doing 120 - 130 km/h on grade-separated, access controlled freeways. For the third, see my post above.
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Old April 23rd, 2009, 09:20 PM   #236
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For a hybrid car 100 km/h is best. When travelling in Germany my parents often drive 110/115 to keep up with the other traffic, but not to consume too much fuel.
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Old April 24th, 2009, 12:00 AM   #237
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Most time efficient is 200 km/h I enjoy driving fast, especially when you don't have to pay for the diesel.
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Old April 24th, 2009, 12:32 AM   #238
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with rolled down windows, eh?

Drving at high speeds will do have significant impacts on your vehicles fuel economy, not every car is aerodynamically optimized.

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Old April 24th, 2009, 12:40 AM   #239
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Most efficient IMO is any speed that is near the lower RPMs,in whichever gears.
Be it 50 in 3rd or 130 in 5th,both require the same amount of work from the engine(not actual values,just to give you an ide what I try to say).
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Old April 24th, 2009, 12:43 AM   #240
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Quote:
Originally Posted by bubach_hlubach View Post
with rolled down windows, eh?

Drving at high speeds will do have significant impacts on your vehicles fuel economy, not every car is aerodynamically optimized.

And what about a company car whre you don't have to pay the fuel?
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