The road
from Dakhla to the border is asphalted and in good state (no
potholes, 100 km/hr possible); after the Moroccan border post there is no
road anymore, only several pistes and it seems you need to know which one
to take or to have a guide to avoid the mines which must be lying around
somewhere. A French guy which crossed with an 25 year old mercedes which
he was going to sell in Senegal told me he called a Mauritanian guide on
his mobile, which then awaited him one km after the border and leads him
all the way through to Nouackchott for 70 euro. This guide also brings
several cars together for more safety.
Moroccan
border post : friendly and quick, no luggage control, 10 minutes, wanted
2 bottles of water as bribe for tea.