The coalition need this to help them get supplies to their troops who are approaching the Iraqi capital Baghdad.
Their plan is to take Baghdad, which would cause all the other Iraqi forces to give in.
But Iraqis who support Saddam are holding this up by fighting small battles in towns on the way to Baghdad.
Fighting in southern Iraq
Fighting is also still taking place in the south of Iraq. 14 Iraqi tanks and armoured vehicles were destroyed outside the city of Basra by UK forces.