 I @-@ 280 begins at I @-@ 80 and US 46 in Parsippany @-@ Troy Hills , Morris County and heads southeast into wooded surroundings as a four @-@ lane highway . The road comes to its first interchange with New Road before crossing the Whippany River into East Hanover . The freeway runs near some fields before heading back into woods and entering Roseland , Essex County at the crossing of the Passaic River . Shortly after the Passaic River , I @-@ 280 has a cloverleaf interchange with the Eisenhower Parkway ( CR 609 ) . At this point , the roadway widens to six lanes and runs near wooded suburban areas before reaching CR 527 at another cloverleaf interchange . Past CR 527 , I @-@ 280 makes a turn to the east before heading southeast into Livingston and intersecting CR 634 . Following this exit , the road enters West Orange and passes through Second Watchung Mountain in a cut . Past the mountain , the road heads back into suburban areas and comes to the exit for CR 636 , where the highway widens to eight lanes here and heads east to an interchange with CR 577 . After CR 577 , I @-@ 280 makes a sharp turn to the south and goes through First Watchung Mountain in another cut , resuming into suburbs again and heading south @-@ southeast as it comes interchanges at CR 660 and CR 508 Spur . 
