Can I move the road to the center of the map?

Solution 1:

Not in the current version of the alpha (16), no. The edge of the map is a protected tile, as are all the tiles of the prebuilt road:

I tried adding a road gate to force vehicles to turn right, but this didn't help as they just patiently waited for the gate to be opened (despite my field being in dire need of riot police and the fire brigade):

However, there is a (very expensive and time consuming) workaround. First you need to build two offices. In the first one, appoint a warden and have him research finance from the bureaucracy screen. Then hire an accountant and have her research land expansion. In total this will take about 1 in game day.

This then gives you the option to purchase land plots on the other side of the prebuilt road for $20,000 a piece. This can be used to give the illusion that the road has been moved and gives you your desired road in the middle:

You must remember to use road gates to allow a secure space for prisoners to cross the road, if that is your intention.