interstate interstate connector spur route interstate colorado auxiliary route interstate auxiliary interstate highways state colorado traverses aurora small portions denver runs north interstate interstate intersects highway known locally avenue construction freeway began continued progressively years final completion route description southern end begins interchange interstate typical lane interstate mph speed limit road heads northeastward southern denver exits road lanes fourth auxiliary lane traversing denver city limits east highway interchanges northern boundary park following exit freeway enters aurora turns northward maintaining lanes auxiliary lanes exit mph speed limit northern terminus upgraded exits avenue 6th avenue signed crossing sand creek freeway interchanges avenue signed highway highway 17th place serving exit enters continuing city aurora route crosses railroad continues north interchanges interstate northbound ramp westbound denver eastbound southbound ramp originates denver enters aurora passes westbound southbound ramp history construction began interstate section avenue sixth avenue opened years later segment mississippi avenue parker road opened construction began segment south parker road completed rest route street interstate completed completion construction road retained original designation highway widened mississippi avenue parker road lanes project widen entire freeway construction portion took place november exit list
Interstate 225