nrc wrote:
Johnnytheboy wrote:
Having spent yesterday going up and down the A34 from Andover to Oxford, I'm with you on the elephant races. Spent I would estimate 50% of the journey back sitting in queues of 20 cars in L2 at 56 mph waiting for one lorry to finish trying to overtake another lorry.
Utter selfishness.
I would agree in principle. But it depends on what speed one lorry is doing over the other. One lorry at 56 overtaking another at 55 does seem somewhat ridiculous I'll grant you (unless it's NOT causing a tailback). I don't condone this behaviour and I certainly don't do it. However, if the same lorry is overtaking one at 50, then that's perfectly acceptable. It's no different than a car doing 70 overtaking another doing 65.
Would you rather keep ALL lorries in the inside lane whatever the speed? That sounds kind of "utter selfish" don't you think?
In certain situations, it's fine, and I do believe the problem is the limiters, not the drivers to a great degree.
But last night as an example saw ~5% of the vehicles on the road slowing the other ~95% by between 10 and 20 mph, purely so that some of those ~5% could go 1mph faster than others.
It was no surprise that L1 was almost empty, meaning that a few chancers were undertaking a dozen cars at a time if anyone in L2 left a decent gap in front, making it even more frustrating for the rest of us, as the resulting bunch caused stop-start to set in.
We've had this debate to death on SS before, but I still can't believe it's not selfish for one vehicle to impede dozens of other vehicles that want to go a lot faster in order that they can travel 1mph faster, especially when the effect of just a few of such acts is to congest the entire road.
Getting nerdy, one could represent a busy 2-lane DC as a two column bar chart, with traffic distributed in either bar 1 (for L1) or bar 2 (for L2). In an ideal world bars 1 & 2 would be the same size, i.e. there would be a 50/50 split in traffic flow between lanes. If we assume a uniform bell distribution in vehicles' ideal choice of speed then the bottom 50% would choose L1 and the top 50 would choose L2.
Unfortunately, human nature means that anyone in L1 who wants to go faster than the flow moves to L2. If they are slower than the current speed of L2, then they slow it down.
Even more unfortunately, the speed distribution is not a uniform bell, but has a pronounced spike at 56mph (representing limited trucks), with something like a bell curve peaking at about 70mph.
This means that everything going faster than the slower limited trucks goes in L2, and everyone goes at about 56mph.