After 8 to 12 days, on average, symptoms of measles can begin. The period between measles transmission and the start of symptoms is called the incubation period.
Driving Laws In Greater Philadelphia. The maximum speed limit in Pennsylvania is 55 miles per hour unless posted otherwise. The maximum speed limit on interstate highways is posted after each interchange; on other highways the maximum speed limit is posted at approximately half-mile intervals.
As an exception, state law defines the speed limit to be 65 MPH on certain highways in Delaware and Massachusetts. States where the DOT has not used its authority to increase speed limits are Alabama, Indiana, Minnesota, North Dakota, Oklahoma, and South Carolina.