shoulder of the highway. The driver may return to the roadway after giving appropriate signal only when the movement can be made in safety and so as not to impede the normal and reasonable movement of traffic." Drivers cannot be stopped by police for driving less than 6 mph over the posted speed limit (10 mph if the speed limit is less than 55 mph and non-radar timing devices are used, as use of radar devices is limited to "members of the Pennsylvania State Police" by §3368c2). In October 2018, Governor Tom Wolf signed into law a bill authorizing the use of speed cameras in active construction zones on Interstate highways. Puerto Rico As effectively from the law, the following speed limits are: in urban areas. in rural areas. in freeways or expressways. in urban and rural school zones, when children are present. Most freeways can have speed limits up to , while other expressways have speed limits up to 55 mph. The rural default speed limit is 45 mph but may be increased to . In residential areas, only multilane roads have limits up to , other roads are restricted to a maximum speed of . Only urban and rural school zones have limits up to . Vehicles carrying hazardous materials are limited to in urban and rural areas. Rhode Island Along two-lane roadways, the default speed limit is during the daytime outside a business or residential district. "Daytime" means a half-hour before sunset and a half-hour after sunrise. At night time and also uncommon on the East Coast, the default speed limit is outside a business or residential district. Through the CBD and residential district, the default speed limit is . Through school zones within , the default speed limit is . Local governments are barred from raising the default speed limits during the day and at night. Rural Interstates are generally posted at but closer to Providence. Divided arterials and freeways other than Interstate are posted no higher than 55 mph. On April 12, 1996, speed limit of 65 mph allowed on rural interstates based on engineering studies. However, the only interstates raised to 65 mph are Interstate 95 from exits 1-9 and Interstate 295. South Carolina Interstate speed limits in South Carolina are posted at . Interstates passing through "Urban" areas are dropped to . The urban area assignment of 60 mph usually includes the metropolitan