How bad is the traffic into NAIA?

How this is measured

We check eight approach roads into the three terminals every five minutes. Each check gives a distance and the time it took, which together make a speed. The roads for one terminal then combine into a single average speed across all their kilometres, so a short approach and a long one sit on the same scale.

Every reading is smoothed over the last half hour, so one odd check cannot move the result. If twenty minutes pass with no data, a terminal reports nothing rather than something stale.

An empty road means the fastest these roads actually reach, not a speed limit. We work that figure out again every night from the last eight weeks, keeping weekdays, Saturdays and Sundays apart.

Everything here is a speed, or a comparison between speeds, and never a journey time. We only measure the last few kilometres into each terminal, so how long your trip takes depends mostly on where you start.

Rain barely touches these roads, but it does delay the flights. Wet hours run at much the same speed as dry ones. Rain gets your plane, not your taxi, so on a stormy afternoon check the departure board rather than the road.