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.
Pennsylvania traffic laws define the maximum speed that any motorist travelling on Pennsylvania roadways can legally drive. Driving over the Pennsylvania speed limit can result in a traffic citation, fine, license suspension, or even arrest. All urban areas have a blanket speed limit of 35mph in Pennsylvania. The speed limit for school zones is 15mph when students are coming to or from school, or whenever the speed limit beacon is flashing. There are a total of 16 states with higher maximum speed limits than Pennsylvania.
When driving within 500 to 1,000 feet of a school while children are outside or crossing the street, the speed limit is 25 mph unless otherwise posted. Also, if the school grounds have no fence and children are outside, never drive faster than 25 mph. Some school zones may have speed limits as low as 15 mph.