Missouri Department of Transportation crews will conduct overnight repairs to the barrier wall along Interstate 44 in Rolla.   One lane in each direction will be closed Sunday and Monday between the University Drive interchange and mile marker 187 starting at 7 p.m. All lanes of traffic will be open by 6 a.m. the following day. Motorists should watch for possible traffic delays while the work is taking place. MoDOT advises drivers to watch for workers and avoid distractions while behind the wheel.    The work is weather permitting and could be delayed.