Cooler wrote:
Also, it is interesting to note that the concern over driving in L2 inappropriately has taken precedence over the safety of flashing your lights and gesticulating at other motorists at 70mph on a motorway.
That's probably something to do with the title you gave the thread.
You keep coming back to the fact that if L3 is clear, a driver in L2 closing on another vehicle should simply move to L3. Well, duh.
However the reason MLMs are reviled by so many motorists is that L3 is often the busiest lane, as a large proportion of the traffic has gone as far to the right as they can in order to overtake slower vehicles. As traffic density increases, L3 is the first to become saturated, leading to waves of braking and eventually congestion.
Ergo the best way of increasing the vehicle flow on a given stretch of motorway that has not reached saturation would be to increase utilisation of the lanes other than L3.
Now, let's try and put some numbers on it in an example (guess who had trouble dropping off last night

):
3 lane motorway.
L1 is occupied by lorries doing 56mph, at 500 yard intervals
L2 is occupied by cars doing 70mph at 250 yard intervals
L3 is occupied by cars doing 85mph at 30 yard intervals
For the purposes of this example these speeds are the maximum speeds at which each vehicle is prepared to travel.
Car A doing 75mph approaches the rear of car B doing 70mph in L2.
Scenario 1. Car B passes a truck in L1, smoothly pulls in to L1, still at 70, until approaching another truck when he returns to L2, during which Car A has passed him, still at 75. No-one has to change speed.
Scenario 2. Car B continues in L2 at 70, ignoring gaps in L1. Car A brakes to 70mph while waiting for a gap in L3, finally gets out, causing all following vehicles in L3 to brake in practice to rather below 70. A braking wave travels back through L3. Car A accelerates to 75 (though feels under pressure to drive faster), gets past Car B and returns to L2. By the time he has to pass the next car in L3, normal flow has more or less been restored. Car A and all the occupants of L3 have to change speed.
Thoughts, please, everyone.