A man died last week after his car plunged off the railway bridge near Joostenbergvlakte.
Traffic chief Kenny Africa said the Golf 7 hit the road barrier on Friday September 1, at 3.45am, and broke apart as it went over the bridge.
Wreckage was strewn across the side of the road, he said.
The crash saw the N1 closed, leading to traffic jams.
Residents who witnessed the scene took to Facebook to warn of the traffic congestion and get more information.
Some claimed the accident had been caused by a tyre burst. Mr Africa could not confirm that, but he noted that “speed played a major role”.
* A motorist caught speeding in Brackenfell last week helped the suburb claim the dubious title of having the fastest speeding driver for the third week in a row.
The suburb also had the drunkest driver for the week, said Byron la Hoe, spokesman for the provincial Department of Transport and Public Works.
The speeding driver was caught on camera doing
202km/h in a 120km/h zone, while the drunk driver was among four others arrested in Brackenfell at the weekend.
He had a reading of 1.28mg/1000ml, five times over the legal limit. Another driver from Caledon had the same blood alcohol reading, Mr La Hoe said.
Mr Africa warned that reckless drivers could lose their licences.
“Do not take unnecessary chances. A driver’s licence is not a right; it is a privilege. And if motorists are going to endanger other people’s lives, due to negligence, we have no other option than to take away their drivers’ licences,” he said.