I think the road rules in Tide of Iron are great and realistic. Here's an example of why: I live in the country. I can drive down a flat, straight dirt road fairly easily. If there is an open field to the side of that roadway, I can veer into the field and drive at nearly the same speed with a few more bumps. Now, someone said that roads only effect trucks in Tide of Iron. Not so. Granted, in an open field (basic terrain space), vehicles and infantry can move at the same speed as on roads (except for trucks which get to move faster on roads). Ah, now try moving units through woods...this expends a lot of movement points. However, try moving through woods on a road...for vehicles, you now spend one movement point as opposed to 3. This is a great benefit to using roads IMHO, and very realistic. If I am driving down a dirt road in the country and veer into a field, I can keep driving. If I veer into the woods...stand-by for airbag deployment.
Case in point: I'm a cop and actually did this one night. I was responding to a hot call down a dirt, country road. This occurred in an area referred to as "open range," meaning local ranchers don't have to fence in their cattle. So, I'm cruising along at a nice clip and as I come around a corner, there's a big, black cow standing in the middle of the road. I hit my brakes hard, but on the gravel I could not stop fast enough. The stupid beast just stood there looking at my car barreling toward it. At the last second I swerved to the right which was fortunately an open field. I just zoomed through the field around the cow, and got back on the road. Granted, the stuff in the back of my car bounced nearly to the ceiling and I kicked up so much dust that I couldn't see anything for a few seconds, but it worked.