The corridors, one by one

Map of the raised corridors

Corridors are coloured by their observed traffic-adjusted crash-rate change while the lower limit applied: green means fewer crashes than before, red means more. Click a corridor to open its page.

Auckland Transport’s reversal list names 32 corridor sections. Adjacent sections of the same road with the same speed change share one crash record, so they are combined: that leaves 26 distinct corridor analyses. 5 listed sections are covered inside another section of the same road. Not analysable yet, Dominion Road: its raised geometry contains too few precisely located crashes for a confident match. The full reconciliation is in the pairing audit. The map’s geographic concentration is the programme’s real footprint, not a data gap: most of the corridors AT raised in March 2025 are in the southeast industrial area (East Tāmaki, Flat Bush, Wiri, Manukau, Pakuranga), alongside Dominion Road and Ian McKinnon Drive near the city centre, Oteha Valley Road in Albany, and Hibiscus Coast Highway and Whangaparāoa Road in the north. The July 2025 local-street reversals, by contrast, span the whole region, see the street table below.

What the corridors show together

Single roads are noisy. The pooled models below combine every eligible road and adjust for traffic exposure, seasonality, COVID disruption and each road’s own baseline. They are the estimates to quote; the road cards further down show how each corridor contributes.

Only the local-street result during lower limits is statistically clear (green). Every other interval includes no change, in particular, the after-raising period is still short, so a real increase cannot yet be separated from noise. Full sensitivity checks are on the main report page.

Every corridor

Observed changes are traffic-adjusted crash rates for that road only, with no other controls; small counts move these numbers a lot. Cards are ordered by crash history so the corridors with the most evidence come first.

The 636 local streets

Local streets were lowered to 30 km/h between 2022 and 2023 and listed for reversal to 50 km/h from 1 July 2025 (an assumed programme date, street-level sign dates are not yet available). Individual streets have too few crashes to model alone, so they enter the pooled estimate above. A controlled comparison against 296 similar streets that kept 30 km/h finds no detectable change in total crashes since the limits went back up (-5%, 95% CI -26% to +22%), though the after period is short. Search the table to find a street.