Makupa Causeway, which was closed on Sunday morning following a train accident, has been opened to the public.
The road was closed after a cargo train, carrying some 250,000 litres of super petrol, derailed at Kibarani sparking fears of a fire outbreak.
KRC on Monday said that experts have ascertained that the road is safe for both commuters and motorists.
"This followed consultations with the committee on site and a technical assessment by Vivo Energy safety staff," Kenya Railways said on twitter.
On Sunday, Maritime PS Nancy Karigithu toured the site of the accident and informed the public that no petrol was spilled into the ocean.
"The leakage came from two wagons, one of them was profuse. Luckily enough, no oil was spilled into the ocean," Karigithu said.
About 3,000 litres of petrol is said to have been lost after the accident.
She said the spill was contained with foam and coolant to ensure it does not get into the Indian Ocean.
Kenya Railways Corporation, Mombasa inspectorate officers, and officers from the Kenya Defence Forces contained the situation.