I'm not sure if this had been noted elsewhere, but I drove up Telford Road today for the first time in a while, at rush hour, and was intrigued that the normal heavy queues heading west near McDonald's were practically non existent.
Then I realised that the previous lane markings had been rewritten.
Formerly was
Left hand lane = turn left and straight on
Right hand lane = turn right at some point after the junction.
This meant that a lot of people powered up the outside lane and then attempted to merge late, slowiy everyone else down.
Now:
Left hand lane = Craigleith Retail Park
Right hand lane = everyone else
And there's a new section of white hat hatching in the bit just beyond the junction so the right hand lane gets guided left again so it can split up for the next lights.
All in all it seems to be working quite effectively.
And all for the cost of a bit of white paint.
*Disclaimer... It clearly has no specific benefit for cyclists (bike lanes or whatever) but it shows that bad behaviour can be the root of jams.