Santiago rations driving by the last digit of the licence plate across the 32 comunas of the Provincia de Santiago plus San Bernardo and Puente Alto, weekdays 07:30 to 21:00 through the May-to-August pollution season. What is rationed is tiered rather than uniform. Catalytic cars carrying the sello verde and registered before 1 September 2011 lose two digits a day; older vehicles without the seal lose four and are barred outright from the Americo Vespucio ring; newer cars go free until an episode is declared. That declaration is the second layer: under the Gestion de Episodios Criticos, the environment ministry's Metropolitan secretariat works from the regional air-quality monitoring network and from separate MP10 and MP2.5 forecasting systems, and each step up to Alerta, Preemergencia or Emergencia adds digits to the ban. Enforcement itself stays manual. Carabineros and the transport ministry's inspection unit read seals and plates at the kerb, and a violation costs 1 to 1.5 UTM. The 2023 CATI law lists driving in a pollution-restricted urban zone among the infractions cameras may issue automatically, but the transport minister said in 2026 that it was still not in force.
An independent peer-reviewed evaluation exploited the air-quality index thresholds that announce the warnings as instruments in a fuzzy regression discontinuity design and found the temporary bans reduce car trips by 6-9% during peak hours and by 7-8% off-peak, consistent with air pollution reductions during peak hours and with higher ridership on Santiago's mass-transit systems in hours when they run with excess capacity (Rivera, Journal of Environmental Economics and Management 108, 2021). No comparable evaluation of the permanent, non-episode restriction was found by this desk, and none is claimed here.
🎓 Lesson
Delhi's odd-even scheme is held back from this atlas because officers checked plates by eye and nothing else measured anything. Santiago's officers do the same at the kerb and it still clears the bar, because the ration is set by a vehicle's vintage class and re-set by an air-quality reading: the instrument sits in the rule, not in the enforcement.
Evidence🔬 Peer-reviewed
Scale🏙️ City-wide
Sources
↗ Ministerio de Transportes y Telecomunicaciones — Restriccion vehicular 2026 (authority)The transport ministry's own standing page for the measure, the correct primary citation for the calendar and the exemption rules. Direct fetch returned HTTP 503 twice from this desk on 2026-07-26; every fact it would carry is instead sourced to the environment ministry and BioBioChile entries below, which agree on dates, comunas, hours and digit tables.
↗ Ministerio del Medio Ambiente — Autoridades lanzan Gestion de Episodios Criticos (GEC) 2026 (authority)Fetched. Dates the GEC period 1 May to 31 August; states the permanent restriction falls on sello verde vehicles registered 2011 and earlier and motorcycles 2010 and earlier across the Provincia de Santiago, San Bernardo and Puente Alto, with non-seal vehicles banned from the Americo Vespucio ring; gives the weekly digit cycle from 4 May and the 07:30-21:00 window; and states that when Alerta, Preemergencia or Emergencia is decreed further digits are added to the ban. Also the source for the Seremi de Transportes handling exemption authorisations.
↗ Aire Region Metropolitana (MMA) — Plan Operacional GEC (authority)Fetched. Names the two instruments behind the episode declaration: the Sistema de Vigilancia de Calidad del Aire operated by the environment ministry, and the Sistema de Pronostico, with MP10 forecasting administered by the Direccion Meteorologica de Chile and MP2.5 by the MMA. The page does not publish the numeric declaration thresholds, so no threshold value is quoted in this entry. The linked Plan Operacional GEC 2026 PDF was retrieved but did not yield legible verbatim text to this desk.
↗ Barahona, Gallego and Montero, 'Vintage-Specific Driving Restrictions', Review of Economic Studies 87(4), 2020, pp. 1646-1682 (peer-reviewed)Abstract fetched. Dates the vintage-specific design to Santiago's 1992 programme and calls it the earliest to use vintage-specific restrictions, which is the basis for this entry's yearStart. Argues that uniform restrictions encourage drivers to buy additional, more-polluting vehicles, while vintage-specific ones can 'yield important welfare gains by moving the fleet composition toward cleaner cars' and should work through which car is driven rather than how much it is driven. Cited for design and dating; it is a modelling paper and carries no measured air-quality result here.
↗ La Tercera — 'Transportes proyecta que ley CATI entrara en vigencia durante 2026' (press)Fetched. Confirms the automated enforcement law is not yet in force, that the transport minister expects it during 2026, and that the four infraction types it will automate include restriccion vehicular alongside red lights, speeding and bus-only lanes. This is the source for the entry declining to claim any camera enforcement today, against several Chilean commercial blogs that assert a 400-point plate-reading network is already issuing restriccion tickets.
↗ BioBioChile — 'Este lunes inicia la restriccion vehicular en Santiago' (press)Fetched. Independent corroboration of the operating rules while the ministry page was down: 4 May to 31 August, Monday to Friday except holidays 07:30 to 21:00, provincia de Santiago plus San Bernardo and Puente Alto; catalytic cars registered before 1 September 2011 and motorcycles before 2010 on two digits a day, non-seal vehicles on four with 'prohibicion absoluta para circular' inside the Americo Vespucio ring; fine of 1 to 1.5 UTM; 'La medida sera fiscalizada por Carabineros, en conjunto con la Unidad de Fiscalizacion del Ministerio de Transportes.'
📎 Cite this project
1001 Smart Cities (2026). “Restriccion Vehicular: Santiago's Vintage-Tiered Plate Rationing” — Santiago, Chile. The Smart City Atlas. https://1001smartcities.org/projects/santiago-vehicle-restriction/ (last verified 2026-07-26). Data: CC BY 4.0.
The underlying data is free to reuse with attribution — see the open data page.
