No formal recommendations have been made to date. A recent study evaluated driver reaction time, DRT, in persons with lumbar radiculopathy who underwent selective nerve root block, SNRB. Whether the block was done on the right or left, immediately following SNRB driver reaction times on average were slower. At two weeks, the DRT remained slower than prior to the procedure in those with right sided SNRB. At six weeks after SNRB, DRTs were at baseline on average. Of the persons tested in this study, even though slower than controls, DRT was still within the range of normal subjects when tested on the road.