[mkgmap-dev] Does road segmentation influence routing?

Hello, I was driving north on I-75 around http://www.openstreetmap.org/?lat=42.9038214683533&lon=-83.6452031135559&zoo... when I approached exit 109, my GPS indicated to stay on the left. This is a motorway with a motorway_link going out of it as usual and I was wondering why I ot that message? Would it be because the motorway is split by a bridge just one node south of the junction? Thanks, N.