I used to do a lot of off-field landings (most of them intentional).
Before you get too excited, check with your insurance carrier. They may have something to say about your plans.
You should also check with the owners of the road (or managers thereof).
If that road isn't available to vehicles at the moment, what makes you think it's available to aircraft? You may be guilty of trespass.
When considering 91.13, careless and reckless can be applied to a lot of things. Careless may simply be failure to comply with 91.103: do you know the runway length, width, weight bearing capacity, surface condition, proximity to obstacles, etc? It's a required part of your preflight; know your destination runway, and the performance applicable thereto. Do you know the gradient?
Seems like a minor thing right now, perhaps; it's a big stretch of cement that 's gotta be an easy land, right? How's it going to look to an FAA inspector, a police officer, a judge, your insurance adjustor, or even a jury, after the fact?
You land, nothing happens. You take off, and have an engine failure. You don't manage to put it back on the ground where you started. Property damage occurs. One lone worker was out there doing overtime. He's hurt. You're stuck on the road and the toll agency makes you take the wings off and truck it home. There's a bad landing and you've got a buckled firewall. The list is endless.
Most of the time, off field landings are fun and if you've never done it before, even a bit adventurous. If you've got to deal with your insurance carrier after the fact, it may be a lot more adventurous than you thought. Remember, even with something as seemingly simple as this, there's more than meets the eye, or more than you might consider at first blush.
Sort of like crossing the rockies in a light airplane...
