Move faster, you are driving like a Sunday driver.
Sunday driver
idiomOne who drives slowly or inexpertly, as for leisure or sightseeing.
Origin
disputed originFrom Sunday + driver, Sunday being a popular day for leisure driving.
I was late for my appointment because I got stuck behind a Sunday driver on the highway.
The impatient commuters honked their horns, frustrated by the leisurely pace of the Sunday driver who seemed entirely oblivious to the growing queue of vehicles behind him.