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Old January 16th, 2010, 05:33 PM   #801
julesstoop
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I would guess it has something to do with population density, emission of pollutants and clean air?
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Old January 16th, 2010, 05:35 PM   #802
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How will a low speed limit make the air quality better??
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Old January 16th, 2010, 05:36 PM   #803
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90 km/h is the optimal speed for pollutants. Most vehicles are most fuel-efficient at that speed. Not 30 km/h.
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Old January 16th, 2010, 05:37 PM   #804
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German standard max autobahn speed is the optimal speed for me. Everything else is slow and boring
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Old January 16th, 2010, 05:48 PM   #805
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Quote:
Originally Posted by ChrisZwolle View Post
90 km/h is the optimal speed for pollutants. Most vehicles are most fuel-efficient at that speed. Not 30 km/h.
Well, somewhere in the 70 - 90 range for most cars indeed, but I wasn't only talking about fuel efficiency, another part of pollution is (I'm not sure if I'm using the right term in English) dust pollution. I can imagine dust emissions are lower at 30 kph than at higher speeds. Thirdly there is noise pollution to take into account. Which is probably also lower at lower speeds.
Still, I of course do agree that 30 kph seems ridiculous on this road.
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Old January 16th, 2010, 06:00 PM   #806
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with the noise pollution, there are already noise screens on both side of the road. And i hardly think that dust is a major problem for those living next to the road
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Old January 16th, 2010, 06:10 PM   #807
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Here in the Netherlands it (dust pollution) has lead to the postponement and even cancellation of quite a few new developments. Mainly caused by strict EU regulation, but still. I wouldn't be surprised if it's a much larger problem in the more densely populated asian metropoles.
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Old January 16th, 2010, 06:11 PM   #808
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I think he means particles. Which can be a major problem. However, particles are the biggest problem right near intersections, where there is a lot of accelerating traffic.

I read a story about a server administrator who had a server park near an intersection, and after particle filters were subsidized, the amount of particle in his filters increased. Why was that? Because particle filters get blown empty when people accelerate. And where does that happen? At intersections.

A stable speed is much more important than the actual most fuel-efficient speed. You can better drive 140 km/h on the motorway than drive an urban road where you accelerate from 0 - 50 all the time.
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Old January 16th, 2010, 06:20 PM   #809
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Thanks for clarifying, Chris.
True. Constant speed (and a smooth road surface) are the most important.
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Old January 16th, 2010, 06:35 PM   #810
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Quote:
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Yep, that's what I'd call the person who introduced those speed limits.

Seriously though, I am staggered. Do drivers actually adhere to the 40 and 30 limits?
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Old January 16th, 2010, 06:45 PM   #811
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The entire elevated expressway is fitted with Averaging Speed Cameras so you have to adhere to those speeds unless your car is fitted with a fake number plate (fairly common).

If anyone is interested on that expressway with the retarded speed limit, watch 3:10-7:00

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Old January 16th, 2010, 06:54 PM   #812
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Croatia, A4, exit #10 Popovec. this entrance ramp (the straight one in direction south) has speed limit 40 km/h . i have entered motorway on that ramp with 120 km/h without any tyres squeaking or any signs of danger. 90 or even 100 km/h would be very suitable there.
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Old January 16th, 2010, 07:09 PM   #813
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Here they will have speed limits lower sometimes 10-20mph(speed trap) or put a ridiculously low speed limit on a large road or worse over the top of the bridge with the sign after the top so they can catch you speeding. What is worse when roads are under construction they put a small speed limit sign since the speed is decreasing.
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Old January 17th, 2010, 07:15 AM   #814
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In the town of Menangle (no street view), just outside of Sydney, there's a school zone sign, like this:

At the end of the school zone...

That's right, traffic is forced to slow to 40km/h from 110km/h, enforced by speed camera. There isn't a "SCHOOL ZONE (40) AHEAD" sign, absolutely nothing.
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Old January 17th, 2010, 11:06 AM   #815
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on which kind of road is there a 110 speed limit next to a school??
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Old January 17th, 2010, 12:58 PM   #816
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Quote:
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on which kind of road is there a 110 speed limit next to a school??
A school on a country highway.
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Old April 8th, 2010, 03:51 AM   #817
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I hope I'm not kicking a dead horse by reviving this thread, but here's my 2¢:
Here in western America and in central Europe, at least, (I can't speak for any other countries that I haven't been to) there should be no speed limit on rural Interstates/motorways, merely an advisory limit of 130-140 km/h.

I do support speed limits in some densely congested and windy roads in urban areas, however, like the S-curves on the I-5 in downtown San Diego. I think the speed limit should be reduced to 100 km/h there.

Last edited by verum; April 8th, 2010 at 03:52 AM. Reason: grammar fail
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Old April 8th, 2010, 03:19 PM   #818
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Quote:
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Those complaining about the speed limits in Europe should spare a thought for Australians. The maximum in most rural areas is 100km/h, with far fewer motorways and outback roads at 110km/h (and 130km/h only in the Northern Territory). And every time a speed limit changes, it gets slower. Its true the roads, drivers and vehicles are bad here. But this is in a country that is vast with long driving distances and few people or traffic in remote areas.

Mark.
I was totally suprised when I drove in Australia, the speed limit on highways in SA is 110 km/h and many motorways in Victoria have 100 km/h limit.

Well then you can also drive your bike on the emergency lane on some motorways.

To the topic:
I think 140 km/h is a good limit on rural motorways and 80-100 km/h in the city.
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Old April 8th, 2010, 04:22 PM   #819
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Quote:
Originally Posted by marki View Post
Those complaining about the speed limits in Europe should spare a thought for Australians. The maximum in most rural areas is 100km/h, with far fewer motorways and outback roads at 110km/h (and 130km/h only in the Northern Territory). And every time a speed limit changes, it gets slower. Its true the roads, drivers and vehicles are bad here. But this is in a country that is vast with long driving distances and few people or traffic in remote areas.

Mark.
There has been talk in Australia about lowering the speed limit on rural roads/highways (not motorways) to 90 from 100. Talk about being over protective. It's not going to achieve much, apart from upping the road toll I think.
I usually do 130 on rural motorways if there is light traffic, even though the limit is 110. I'd go faster, but in Victoria you loose your license for some period of time if you do 30 to 40 over the limit.
I think the maximum motorway speed limit should be 150 in rural area's and 100 in urban area's. I think doing over 200 on a motorway is really risky, I know some of the Germans cope well doing these speeds, but frankly I think it's crazy and unnecessary.
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Old April 8th, 2010, 04:39 PM   #820
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There is an illusion that German autobhans are fulled of people driving > 160 km/h. Because most drivers are already driving faster than the overprotective limits posted elsewhere, people tend to stick around.
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