Where would you store power in a "smart road" economically ?
Wind and sun are the worst once to cope with but wave/tidal also has low output periods.
re 'generation' most EU countries already operate "feed in" tarrifs to utilise the power generated in the supply grid. Note this requires a sophisticated grid management and distribution network that none have yet - thus in Scotland the power distributors often PAY the wind turbine generation companies NOT to supply power as they have no more distribution capacity.
Until we sort out sensible cost effective storage and improved distribution it is still a way off for the real benefits.
Check IAV , German patent for wireless charging and payment solution
"A woman without curves is like a road without bends, you might get to your destination quicker but the ride is boring as hell'