Business model: least work routing for truckers, big RVs, people towing trailers, etc. Pitch as a fuel-saver, promote with ad-supported local and special-interest ads. Support click-n-drag re-routing as Google Maps does now.

Note that while many truckers travel recurring routes, some pick up ad-hoc LTL (less-than-truckload) shipments and must replan routing with nearly each shipment. For fun, demo using:

    Tucson, AZ     -> Tucumcari, NM
    Tehachapi, CA  -> Tonopah, NV