Quite apart from the actual Gautrain, I think most of us are waiting breathlessly for the connection network.
Using one integrated public transport ticket, commuters can change services between Metrorail train and Gautrain. Alternatively, commuters can make use of 125 luxury Gautrain buses that provides transport to destinations within a 15 kilometer radius.[2]
The cost of traveling to a station with the Gautrain Bus Link will be between R4.00 and R11.00.[26]
Theoretically, it may be possible to make use of the Gautrain buses to get from point A to B, even if you don't actually use the Gautrain, because the Gautrain bus stops will surely be spread across prominent areas/addresses and could potentially service thousands of passengers who would otherwise have to get into their cars and drive 5 or 10km to work BECAUSE there is no other public transport. That way, we can leave the highway to you poor okes who have to use it during the day!
Once the pressure on the feeders to the highways is reduced, plus the Gautrain service for genuine "commuters", the pressure on the national roads should be relieved.
Don't only build broader highways: it is just as important to sort out the feeders!