Are we thinking of the same exit
i am thinking of the one at St Saturnin? it is signposted to Le Mans Centre Ville to the left when you get to the first roundabout after the péage. If you turn right at that roundabout you then used to turn left after the bridge to get to where the all the hotels are this is now a roundabout as well.
we are there for the thursday night then go down in to the centre for the rest of the weekend, feed up of trying to get taxi's to come and pick us up
Andy