I beg to differ. There's no design flaw i on the bridge. Designed to the best gradient possible, with appropriate cambering.

When we design in Structural engineering, any failure is a collapse.

Let's check the year of construction to the year of current use and traffic on it. https://twitter.com/seunonigbinde/status/1340355806252961792
The torque of vehicles (clutch precisely), a 1.8 2014 corolla will find it hard to climb a steep compared to a 2.0 2005 corolla.

Who checks the 33,000l compared to engine capacity of these articulated vehicles?

You don't import the head of 1942 trucks and give it to Dantata..
to weld 33,000l tanker to its back and you expect it to climb hills.

Many of them approach that steep on bad clutch, and when it's time to climb, they can't and eventually roll over.

Dantata in some cases will weld 40,000l capacity tank, no regulation.
These guys clutch down when they approach the descent, and when it's time to climb, they try to return back to gear, but the weight.

Have you considered that it doesn't happen on the section inward Lagos? Because they always come in empty.

The engines are not burdened.
Back to the design,there's a very deep valley underneath the bridge,one end of the bridge & the other end of the bridge are on two different levels above the valley.

The best possible gradient,to link those two heights take into consideration stopping and braking sight distance
Foundation depth, the thickness of columns and aesthetics.

The amount of filling to be done underneath the valley 2 reduce the gradient will affect those who wants to link that estate on the right from alausa(which can be corrected through tunnels) but then remember na 9ja we de
If there's going to be another gradient to correct the existing, cost implications must be considered (which I'm sure those who awarded the contract and those who tendered the bid of what we have now looked into) we will have a gentle gradient landing far beyond the terminating
Point of the existing.

Otherwise, we will just have the kind of useless gradient that we have for those crisscrossing from alausa into that omole estate on the right.
Who remembers the deadly one of recent about 50vehicles?

the motor boy was trying to hold the tanker by "shorking " the tire with wood in traffic, till it rolled over and burst in flames.

To be a Nigerian is a risk

An Engineer's flaw will end up in collapse, it can't be hidden
You think Otedola Bridge is steep, go check out Eshima Ohashi Bridge in Japan, compare its steepness, slope and gradient, and compare it to rates of truck accident on it.
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