 Between Warmsworth and Balby it meets the A1(M) at Junction 36.From there it heads east to Doncaster, then passing Armthorpe it heads to the M18 at Junction 4 where the road terminates.The A630 has a junction with M1 at Junction 33 at Catcliffe, another with A1(M) at Junction 36 at Warmsworth, and finally at M18 at Junction 4 at Armthorpe where the road terminates.