Your map sounds pretty basic at the moment, but in the same vein as Arteen's linear vehicular maps - basic, accessible, straightforward, yet with enough openendedness to provide some depth to gameplay. Here's the thing though: we already have maps like that. Arteen made a good handful, and there are scores more of varying quality.

Do something original, I say. Think of what has and hasn't been done yet, and then start on a new concept from there. I'm more than willing to help out with ideas.