<Warning, this might only make sense to those that have spent time in Sheffield>
Not today, but on Tuesday I learnt that the SatNav in my car seems to have a liking for the Hallamshire Hospital.
Leaving DL7, set satnav destination as S3.
Set it to Fastest route.
Takes you down the A61 into Sheffield, right past said hospital.
So far, so logical.
However, ignore it's pleas and begs and go over the Tinsley Viaduct instead, coming off at the Parkway junction, the logical way to S3 is to go left at the end of the Parkway (heading past the station to Ring Road South) but, no, the SatNav decides you REALLY want to go around the North and past the Hospital.
On the return leg, set it to DL7 and fastest, again, and it thinks that sitting in car park that is the ring road approaching Upper Hannover Street is faster than just going to the Parkway, just so you can go past the hospital, again.
I now have done the trip enough to ignore the satnav* or not even use it.
*It is useful to leave it on, even if you know where you are going as it tailors the traffic alerts to your route.