 I @-@ 70 has one official branch in Colorado , Interstate 270 , which connects the interstate with the Denver – Boulder Turnpike . Where these two freeways merge is the busiest portion of I @-@ 70 in the state , with an annual average daily traffic of 183 @,@ 000 vehicles per day . While State Highway 470 and E @-@ 470 are not officially branches of I @-@ 70 , they are remnants of plans for an I @-@ 470 outer beltway around Denver that were cancelled when the allocated funds were spent elsewhere . 
