When Satnavs became widely adopted 10 years ago, the traffic on Alexandra Park Road N10 doubled (DfT stats), and has stayed at the same level ever since (see chart). The newish Cabinet member for 'Strategic Transport', Cllr Matt White, remarked at a recent meeting that Satnavs were directing drivers off the north circular to avoid a chunk of the latter, to go along local roads instead - up Colney Hatch Lane, down the B106 (=Al Pk Rd N10/Albert/Durnsford), straight on up Brownlow (also the B106) and back onto the north circular.
That is an additional 10k motor vehicles per day displaced onto the B106, on average. Preventing this would not result in increasing traffic on the north circular by this amount, just stopping them coming off it, and then onto it again.
The cars race down the B106 at an incredible pace – such a lovely straight road ! - and the police understandably do not have the capacity to control it. When my daughter was at Alexandra Park School, a fellow student was hit by a car when she was crossing Durnsford/Albert (right opposite the school), and never recovered. There are two schools on this road and a GP surgery (Library, shops ...). Some serious measures need to be introduced to deal with the speeding cars. A busgate on Brownlow may well be it. The school children need to be able to walk and cycle safely to school.
Traffic at the moment is of course also hugely increased in London (on 2019 levels) because of drivers' concerns about using public transport – in Haringey it has increased by 20% (quoting Cllr. White).
The Satnav effect is now widely recognised, whereby algorithms direct drivers onto smaller roads to save time. Haringey planning officers illustrated it at last week's meeting about the Bounds Green LTN with images of alternative routes through local streets recommended to drivers by Google. The Satnav advice is to come off Bounds Green Road and Green Lanes onto smaller roads – so the traffic on BGR reduced by a third ten years ago, and that on Green Lanes, just south of the junction with BGR, by over a third. Traffic on Wood Green High Road is now lower than on Alexandra Park Road N10 (not entirely as a result of the satnav effect, however).
The Satnav effect in London as a whole is very evident from the chart on the left – traffic on main roads has not increased in the ten years prior to the pandemic, but overall traffic levels were increasing as a result of the increase in traffic on unclassified and C roads.
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Sources. London traffic: https://roadtraffic.dft.gov.uk/regions/6 (second chart).
Other stats: https://roadtrafficstats.uk/, which contains traffic data from every traffic census point in Great Britain, as compiled by the Department for Transport. You can enter a road number, and then choose a census point if there is more than one (there may be none).