As far as I have been able to determine, no one has ever scientifically compared the capacity of historic street grids with modern road systems.
https://www.cnu.org/publicsquare/2018/06/28/copious-capacity-street-grids
Short traffic signals are pedestrian-friendly.
https://walkablestreets.wordpress.com...ood-development-will-the-traffic-work
urban corridors had considerably less congestion despite densities that were many times higher than a comparison suburban corridor
https://www.cnu.org/publicsquare/az-d...ense-urbanism-cuts-traffic-congestion