One of the LASTMA officials at Okota Roundabout according to the account was trying to take over the steering of a Toyota Sienna vehicle from the driver while in motion.
It was alleged that the driver had violated traffic rules.
In the process, the vehicle reportedly lost control and rammed into a tricycle on Bayo Oyewale Street.
The pregnant woman was said to be taking her children to school when tragedy struck.
The incident sparked a protest, as an irate mob descended on the LASTMA official.
However, the timely intervention of a team of policemen saved the official from being lynched, as the officers fired tear gas cannisters to disperse the mob.
The policemen also cleared the barricade mounted on the road by the protesters, as they whisked the LASTMA official away.