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.
Quick, what do Texas and Washington have on common? They're the only two states that require coaches with vehicles in tow to observe a speed limit of 60 miles per hour [source: Hitch Me Up]. In general, many states set a speed limit of 65 for coaches with vehicles in tow; others set a limit of 55 mph. This is a good example of how towing regulations can change when you cross state lines, and why you should be aware that they often do.