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Why is there traffic
near me right now?

You are stopped, nothing is moving, and there is no obvious reason. In Nairobi it is almost always one of seven things. Here is how to work out which, and what each one means for how long you will be sitting there.

The seven things that stop a Nairobi road

  • A collision: even a minor one. Two vehicles exchanging details in a live lane will hold a road for as long as they stay there, and a serious one closes lanes until recovery arrives.
  • A breakdown: more common than crashes and often worse. A lorry or matatu that has stopped across a lane cannot be pushed aside, and on a road with no hard shoulder it blocks until a tow arrives.
  • Roadworks or a lane closure: the planned kind, which is usually announced, and the unplanned kind, such as a burst water main or a collapsed section after rain, which is not.
  • Roadside activity: any check or inspection in progress at the roadside. The vehicles pulled over are not the problem. The problem is everyone behind them slowing to look.
  • Rain: the biggest single multiplier in Nairobi. It slows everybody, floods the underpasses first, and turns any unpaved diversion to mud.
  • An event, procession or closure: a match, a marathon, a VIP movement or a demonstration. These often close roads with little or no notice to drivers already on them.
  • Plain volume: no incident at all, just rush hour. This is the most common answer, and the one people are least willing to believe when they are sitting in it.

How to tell which one you are in

You can narrow it down from the driver's seat without any app at all. Four questions:

  • Is it moving at all? Slow but continuous is volume. Completely stopped for several minutes, then a short surge, then stopped again is a blockage ahead being let past in batches.
  • What is the oncoming side doing? If both directions have stopped, something is physically blocking the carriageway or a junction has failed. If only your side has stopped, it is more likely volume or a lane closure.
  • Is this a normal time for this road? A jam at 7:30am on Thika Road is unremarkable. The same jam at 11am is an incident, and worth acting on.
  • What are the matatus doing? When they start overlapping onto the shoulder or the service lane in numbers, the drivers with the best local information have concluded this is not clearing soon. It is a crude signal, but it is a real one.

How long each one usually lasts

Rough guidance, not a promise, and rain changes all of it:

  • Rush-hour volume: it eases when the peak ends, so somewhere between 30 and 90 minutes. Waiting it out on the road is usually slower than waiting it out somewhere with coffee.
  • A minor collision: often clears in 20 to 40 minutes once the vehicles move off the carriageway, though the queue behind takes longer to drain than the incident took to clear.
  • A lorry breakdown or a serious crash: plan for an hour or more. Heavy recovery has to get through the same traffic you are in.
  • Flooding: an hour or two after the rain stops for most roads, longer for the underpasses.
  • A closure for an event or procession: as long as the event. This is the one where turning around early pays.

The general rule: the first ten minutes tell you very little, and the next ten tell you almost everything. If a stopped road has not moved at all in twenty minutes, it is not volume.

How to find out for certain

Every method above is inference. The only people who actually know are the ones at the front of the queue.

A map app will show you that the road is red. It will not tell you whether that red is a burst water main that will take three hours or a matatu that is already being pushed off the road. Radio traffic bulletins are useful but come on a schedule, and by the time one runs, the thing it describes may have cleared.

Rada exists for exactly this gap. Drivers at the scene report what they can see, and then keep updating it: cleared, still bad, getting worse, traffic moving. You save the roads you actually use, and you get told when something happens on one of them, before you leave rather than once you are already committed.

Quick answers

An off-peak jam is nearly always an incident rather than volume: a breakdown, a collision, a closure or flooding. If a road is stopped outside its usual peak window, treat it as something that has happened rather than something that will pass on its own, and check before you commit to it.
Rush-hour volume eases with the peak, so roughly 30 to 90 minutes. A minor collision often clears in 20 to 40 minutes. A lorry breakdown, a serious crash or flooding should be planned around as an hour or more. A road closed for an event lasts as long as the event.
Usually because the blockage that caused it was removed some time ago and you are sitting in the queue it left behind. A jam outlives its cause, sometimes by a long way, which is why the road can open up with nothing to see at the front.
It depends entirely on which of the seven causes you are in, which is the whole reason it is worth finding out. Turning around is usually right for a closure or a serious incident, and usually wrong for ordinary rush-hour volume, where the alternative route is filling with everyone else who had the same idea.
Yes. Add 30 to 60 minutes to almost any journey, and expect the underpasses and the low-lying approaches into the CBD to flood before anything else. Any road that is unpaved or dug up for works becomes far worse than slow.

Know before you are in it

Save the roads you drive in Rada and get a notification when another driver reports an accident, a closure, roadwork or a hazard on one of them. Free to start, and it takes about a minute.

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