I wanted to know the same thing and as there was no answer i clicked on the link below and it says Australia has a strong five-man team in the 245km race, led by Tour de France runner-up Cadel .. Go...
The first road race was held in the 1896 games in Athens
28 miles.
It is 10 kilometres, or 6.2 miles.
I believe they're in August - of this year