Speed limits on more than 100 miles of two interstates maintained by Pennsylvania's highway department will rise to 70 mph for the first time starting Monday, Aug. 11.

The sections of highway include 88 miles on Interstate 80 in northern Pennsylvania's Clearfield and Clinton counties and 21 miles of Interstate 380 in northeastern Pennsylvania's Lackawanna and Monroe counties.

Transportation Secretary Barry Schoch has said other highways could see increased speed limits next spring or summer.

About 35 other states already allow speeds of 70 mph or more.