What the road is like
The M17 is a main road, not a motorway. Two lanes, an occasional third for overtaking on the climbs, and a lot of bends through the canyon. It is not demanding, but it is not a road you cover at a hundred and thirty either.
In summer, and at weekends especially, queueing behind a lorry is normal and two hours easily becomes three. In winter the canyon section sits in shade and can be slippery in the morning, though it rarely holds snow the way the mountains do.
Fuel and tolls
There are no tolls on this route because it uses no motorway. There are plenty of filling stations in Konjic, Jablanica and before Mostar, but the gaps through the canyon itself are longer, so do not set off on the reserve.
Mileage inside Bosnia and Herzegovina is unlimited with us, so Mostar and back does not make the rental cost more.
How much time to allow
Leave Sarajevo at nine and you are in Mostar around eleven, with the whole day for the old town before driving back in the evening. That is the usual shape of it.
If you are adding Kravice, count another hour and a half each way from Mostar and start earlier. It makes for a long day, and that is where a driver earns its keep.