Wednesday, Oct 11, 2017 at 00:08
Gronk, it is obvious you have no idea how speed limits are set.. When roads are built they are designed with different road surfaces, cambers, point of entry etc. These all play a part as to the way a speed limit is set. Example: M1 starting from
Sydney heading north you start with a speed limit of 80kph, you travel 2 Klm and it turns into 110kph, after crossing the bridge and heading up the
hill the limit drops to 100 or 90 when wet, at the top of the
hill it turns back to 110. 2 Klm before it ends the limit is reduced to 80 then 500m to end it reduces to 60 go around the round about and it’s back up to 80, when you get to Heatherbrae it drops to 70 go through the round about and it back to 110, another 10 or so Klm down the road the limit changes to100. So let’s analyse this.
At the start 80 kph you have a lot of traffic trying to merge, once they settle into their journey the limit is raised to 110, once over the bridge and heading up
hill it’s 100 dry 90 wet (the road surface is the same but the drainage is not, as water runs across the road not running straight into the drain. Bad design at the time.) You are coming to the end of the freeway and the speed drops to 80 then at 500m it drops to 60. This is to slow people down before reaching the roundabout. After the roundabout it’s back up to 80 because of extra traffic and traffic entering and leaving the main road. You get to Heatherbrae and it drops to 70 because they are a lot of driveways and traffic entering and leaving the main road and you are about to enter a roundabout. Then back to 110 for a few more Klm till it drops back to 100 ( the road surface has not changed nor the design of the road but there are 3 or more entry/exit points without slip lanes). You might ask yourself why is the speed limit 110 then 100 then back to 110, the road surface is the same and it doesn’t look like anything has changed but why drop that 10 kph, it’s because there is a likelihood that other vehicles might enter or exit the road without any warning. The drop in the speed limit tells me that something has changed in the conditions and be aware that someone might pull out or pull over with little or no indication.
I can’t give you the formula that is used but I do know that eg: if a road has a limit of 110kph and you add one extra driveway in a set number of klms the limit is dropped to 100, the more driveways you add the more the limit drops. So you suggesting that an idiot in
Canberra just makes up the speed limit, you are wrong. There are a lot of factors to take into account.
As for having a head on you could be killed doing 60 kph, and the reason for the head on is an asshole overtaking being in a hurry and not waiting for the right time to do it safely. Or someone asleep at the wheel. So when you T bone or run up the backside of someone it is because you were speeding, speed will kill and has killed, statistics don’t lie.
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