The Nairobi Express Way will be completed in the next 30 days.
Transport and Infrastructure CS James Macharia says the double-decker road will be opened by 25th December.
He said the road is now 75 percent completed and all closed sections from Mlolongo to James Gichuru will be reopened.
The project is a legacy priority for President Uhuru Kenyatta.
Political analysts say the President may want to drive himself on the road before the Christmas break.