M1 Traffic: Recap as police incident closes lanes on major north London road ahead of high-profile match

m1 traffic was halted southbound between junction 2 (A1 Watford Way / Barnet By-Pass) and junction 1 (A406 North Circular / Staples Corner) after what has been described in initial reports as a “police incident. ” The closure forced lanes to stop and produced long queues that tail back toward Hertfordshire; the disruption came as fans were travelling south for a high-profile Arsenal versus Manchester City match.

M1 Traffic: What happened and immediate effects

Emergency services stopped lanes on the M1 southbound on the stretch between J2 A1 Watford Way and J1 A406 North Circular. Hertfordshire police led activity on the carriageway between junction 2 (Finchley) and junction 1 (A406), and National Rail said initial disruption followed a multi-vehicle crash between junctions 4 and 1. Images taken from the scene showed queues extending back toward Hertfordshire, with motorway cameras capturing heavy congestion heading southbound toward junction 1.

Traffic England stated delays of around ten minutes were being experienced, and that normal traffic conditions were expected between 12: 45 and 13: 00 ET on 22 March 2026. National Highways said the incident was later resolved and traffic released on the M1 southbound between J2 and J1, though long delays remained and were expected to ease gradually.

Why this matters right now

The closure affected a critical north–south artery at a time of elevated travel demand. The southbound stop occurred as supporters were travelling towards a major cup final between Arsenal and Manchester City, and one live account noted congestion about 1. 9 miles from the Wembley turn-off. Even short stoppages on this corridor produced cascading delays: queues that began near the London boundary were visible stretching back toward Hertfordshire, and multi-vehicle involvement in some reports increased clearance time and lane-blocking risk.

Operational consequences included traffic managers needing to sequence lane releases, emergency services coordinating across county boundaries, and tolls of delay for motorists on diversion routes. The sequence from stopped lanes to gradual release, as described by National Highways, illustrates how a relatively local incident can rapidly translate into network-wide friction at peak movement times.

Expert and official perspectives

Hertfordshire police led the response between J2 and J1, while Traffic England provided real-time delay estimates and normalisation windows. National Rail linked the initial disruption to a multi-vehicle crash between junctions 4 and 1. A witness at the scene claimed there had been a “hijacking attempt, ” but that allegation remains unconfirmed by police or official channels. Another on-the-ground remark captured the immediate recovery phase: “Turns out someone had broken down in the outside lane. Moving now. “

Those statements illustrate the mix of confirmed agency information and provisional eyewitness accounts that typically accompanies sudden motorway stoppages. Official agencies focused on traffic management and lane release; emergency responders attended to vehicles and any injured parties, while traffic-monitoring services tracked queue lengths and advised expected return-to-normal windows.

Operational takeaways for road users include the value of leaving additional travel time for major events, monitoring live traffic bulletins from traffic agencies, and giving way to emergency operations when lanes are closed. For network operators, the incident highlights the intersection of crash response, cross-jurisdiction coordination, and the amplification of delay during event-related peaks.

As lanes reopened and National Highways indicated traffic had been released, questions remain about the precise sequence of causes across the stretch between junctions 4 and 1 and the decision processes used to reopen lanes safely and swiftly. Will follow-up statements from the responding agencies clarify whether a breakdown, crash, or other criminal allegation precipitated the stoppage, and will lessons from the congestion pattern lead to revised event-time contingency planning for this arterial route?

The m1 traffic interruption provided a sharp reminder of how a single incident can ripple across a busy commuter and event corridor; as authorities continue investigations and clearances, motorists and organisers will watch for any changes in guidance for future large-movement periods.

What should traffic managers and event planners change next time to prevent queues from cascading so broadly along this key route?