The paper evaluates the social benefit of extending an electric road for trucks to secondary motorways. It provides an updated analysis of its social benefits on main motorways. Two options are evaluated: propulsion only and propulsion with recharging. The propulsion and recharging option is found to have higher social benefits, but trucks with larger batteries are a better option for secondary motorways. Plug‐in battery‐electric trucks with large batteries are found to yield higher welfare than electric roads on main motorways. The analysis includes sensitivity to fuel cost savings, truck usage, user charges, investment cost, and battery cost to identify inflection points where investing in electric roads becomes welfare-increasing.