Road Pictures of Many Places
In my opinion, the roads in Argentina were relatively safe to travel on.  The biggest danger that I faced was the usual, trucks, wind, and the wind blasts from the trucks going down the road next to you.  But as well, at other times, there were virtually no cars at all for twenty minutes or more.  That of course was way out in the pampa and in Mendoza Areas, which were sparesly populated compared to closer to BA.  But there is nothing to greatly fear about thinking of going for a ride in Argentina.  Go for it.