45 southbound construction initial phase construction 45 scheduled begin sunday october 1 southbound lanes closed sunday night 7 00 p detour 10 eastbound us 59 southbound two southbound lanes reopened 45 beginning october 2 5 00 southbound exit ramp pierce dallas closed initial phase work southbound exit ramp mckinney open anyone typically using routes must find alternate route mckinney pierce dallas exits alternately open subsequent phases roadwork southbound main lanes reopen january 18 2001 additionally entrance ramp allen parkway eastbound closed reconstruction south northbound bridge downtown district updating web site detailed road closure maps suggested alternate routes information available www downtownstreets com 45 45 html bookmark reference site updated road construction projects progress