Abuja - Thirty passengers died on Sunday after the trailer carrying them tumbled down the Lagos-Ibadan Expressway, Punch reports.
Two rams were also killed in the collision, while 50 other people sustained various injuries.
The Federal Road Safety Corps (FRSC), however, disagreed with the reported figures, saying that only 17 people were killed in the accident while 79 others were left injured.
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Yusuf Salami, Oyo State Commander of the FRSC, revealed that the accident involved two vehicles and was caused impatience, speeding and a struggle for the right of way.
Both vehicles were alleged to have been travelling to Lagos when the incident took place.
The second vehicle involved in the accident, a Peugeot bus, was loaded with passengers when the incident took place.
The trailer was suspected to have been carrying illegal passengers when they met their demise.
Read more at Punch