I'm sure someone here will know the answer to this question

I currently have to negotiate a set of roadworks where a new shopping centre is being built. The roadworks are on a busy stretch of dual carriageway but, due to the inability of drivers in this country to use both lanes then merge in turn, it takes ages to get through them.
In case it's relevant, the roadworks are in Glasgow,
here The red shopping basket is the site of the new centre. Access roads are currently being created, including a new slip off the motorway. The problem is heading east along the d/c to the motorway. The clueless wonders all get into 1 lane as they come off the roundabout. In rush hour the queue extends across the roundabout and causes traffic to queue in all 5 roads leading on.
I was hoping to speak to whoever sets up the works and suggest that they alleviate the problem by signing the road to tell drivers to use both lanes and then merge in turn to use all the available road space. Anyone know who I should ask to speak to?