<P> Also the speed limit on county road is 30 MPH Fines for speeding are at least $50 by law . Exceeding the speed limit by 30 mph or more is considered a criminal offense . </P> <P> The speed limit on Maryland's Interstate Highways are posted by default at 65 mph although 70 mph limits can be posted after a traffic and engineering study . Effective October 1, 2015 the speed limit on I - 68 is 70 mph except for a seven - mile section around Cumberland . Effective April 4, 2016, the speed limit on I - 70 has been increased to 70 mph from the Pennsylvania state line to MD 180 in Frederick County and from MD 144 in Frederick County to US 29 in Howard County . Maryland's urban freeways normally have speed limits of 55 mph (like I - 495) or 60 mph, although some stretches are signed for 65 mph travel such as portions of I - 95 and I - 97 in and around the Baltimore suburbs, I - 70 around Frederick, and I - 81 around Hagerstown . I - 70 around Hagerstown is posted at 70 mph . More restrictive limits are found on I - 83 south of North Avenue when approaching downtown Baltimore and on I - 68 through Cumberland, both sections being marked at 40 mph . </P> <P> Four lane non-interstates and non-freeways are posted at 55 mph . This includes the expressway grade roadways like US 50 and US 301 east of the Bay Bridge, US 15 north of Frederick to the Pennsylvania state line, MD 404 around Denton and US 29 between I - 495 and I - 70 . </P> <P> Normally, speed limit drops are in 5 mph to 10 mph increments . However, one speed zone drops from 55 to 25 mph along US 301 southbound at the Nice Bridge for the toll plaza . </P>

What is the speed limit on route 66