 WSDOT began preparing to install a median barrier and widen SR 502 to four lanes between the I @-@ 5 interchange and the western Battle Ground city limit in July 2012 to accommodate increasing traffic on the highway , which has a speed limit up to 50 miles per hour ( 80 km / h ) . Construction for the $ 85 million project began in earnest in 2014 . New Mill Creek wetlands were created , to mitigate for wetlands buried by construction , which included the driving of 1 @,@ 200 concrete pilings . The new , four @-@ lane highway , which includes 10 @-@ foot ( 3 @.@ 0 m ) shoulders for bicycle and pedestrian travel and traffic signals at major intersections , opened on June 27 , 2016 . 
