 Upon leaving the downtown area , the route turns north onto Gaston Avenue and heads into residential areas again , with County Route 612 continuing east on Main Street . At the intersection with Union Avenue , Route 28 turns to the east to follow that road , which has a 40 mph ( 64 km / h ) speed limit . The route continues past residential neighborhoods containing some businesses , briefly forming the border between Bridgewater Township to the north and Somerville to the south before fully entering Bridgewater Township . It intersects County Route 633 ( <unk> Avenue ) before crossing County Route 675 ( Chimney Rock Road ) , where Route 28 widens into a four @-@ lane divided highway that heads through industrial and commercial areas . The road makes a junction with County Route 685 ( Promenade Boulevard ) before coming to an interchange with Interstate 287 . Past this interchange , the route continues into Bound Brook as a two @-@ lane undivided road with a 35 mph ( 56 km / h ) speed limit and heads through business areas . In Bound Brook , Route 28 intersects the southern terminus of County Route 525 ( Thompson Avenue ) and County Route 635 ( <unk> Avenue ) before heading into more residential surroundings and crossing County Route 527 ( Mountain Avenue ) . 
