Limiting trucks to no more than 65 mph might have saved lives and fuel costs, but Trump administration says it would raise ...

Variable speed limit signs are among the technology improving safety on I-76 in Philadelphia 02:19. Rear-end crashes have plagued the Schuylkill Expressway for years.

Signs for this, marked by a circular blue sign with the minimum speed limit within, are generally found in areas where increased congestion can be dangerous, such as tunnels.