Comment by jonah

There are simpler ways to get a conduit under a driveway than a huge DB machine. I'm boarding a flight, but look up using water (dig a pit on either side of the road, attach water hose to piece of conduit, and push the conduit under the driveway using the water to erode a hole as you go.)

The there are also smaller hydraulic ram tools designed for pushing a pipe under a driveway.