Speed cameras are posted at 15 locations, from Old York Road down to the stadiums, in South Philadelphia.
A 60-day warning period begins Monday.
Then, starting November 14, drivers clocked at 11 miles-per-hour above the 25 mile-per-hour speed limit will be hit with a $100 fine.
RELATED: Roosevelt Boulevard speeding violations decrease by 91% since cameras installed: PPA
City leaders say there were more than 200 serious or fatal crashes along Broad Street from 2020 through 2024.