The 爱游戏体育 is extending SR 520鈥檚 new transit/HOV system onto Interstate 5. Work includes construction of 23 retaining walls; five ramps (full depth replacement of the roadway cross section, utilities, and walls); a new, three-span steel girder bridge; and reconfiguring an existing southbound off-ramp to be reversible (full depth replacement, alignment adjustment, concrete barriers, and soldier pile walls).