> "Given how cheap solar panels are now (<$1/W), and how expensive an urban road is ($2000 a linear foot!), the solar road competes not against a solar rooftop

> "Given how cheap solar panels are now (<$1/W), and how expensive an urban road is ($2000 a linear foot!), the solar road competes not against a solar rooftop installation (15% efficient) but against a conventional road (0% efficient)" It competes against conventional road + solar rooftop. I don't think it will ever be price-competitive or efficiency-competitive with doing both things separately.