> The costs of a cycling path that support the same flow of people is negligible compared to that of a corresponding highway.

That's not true The ground pressure of a bicycle is higher than the ground pressure of a car.

Some bike tire pressures exceed 100 psi. Only the largest trucks have ground pressures that high. A typical passenger vehicle has a pressure of around 36 psi.

The ground pressure of someone in heels is even higher than that. There's a reason sidewalks are made of cement while roads can be made of cheaper asphalt.