DanBaker

Hi The remedy is to cone off  the fast lane (with plastic or concrete barriers or the orange plastic posts that scew down )

paint a bright yellow offset on the road where the road is wide enough 

this enables the turned traffic to take off and merge safely 

where it is. Not wide enough reduce to one lane with big warning signs on approach 

not so good but in many places there is already a widening that has been put in for I assume for slow traffic and trucks ( it is normally used when 4 cars u turn together so would not be required for that purpose and could be used for road widening to accommodate the offset

there would need to be some provision every two or 3 u turns for long trucks

the new u turns could be sign posted 

"3 kilometres to SAFE U TURN"

i have have seen this done and it works well

in Udonthani near Tesco they did half of the plan and coned off for the traffic slowing to u turn on one side but the traffic still had to enter the fast lane on exiting the u turn into the fast lane , they may have completed as was under construction when we left but I doubt any offset lines or signs

and the road is wide enough for an offset 

hope this helps just getting it done??

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