 There are also plans to improve the interchange with I @-@ 5 , which currently involves a traffic signal connecting Vista Way and SR 78 with the ramps to I @-@ 5 southbound . Plans call for adding more lanes to I @-@ 5 and SR 78 as well as for the construction of a new ramp from SR 78 westbound to I @-@ 5 southbound and from I @-@ 5 southbound to SR 78 eastbound . The nearby lagoon has served as an obstacle in constructing additional ramps . In 2002 , the I @-@ 5 northbound to SR 78 eastbound ramp was widened to two lanes to ease congestion . At 2015 meeting , the Oceanside community expressed concerns about a potential " flyover " ramp design for the new interchange . The project is scheduled for completion in the late 2020s . 
