Where is congestion worst after the incident?

Residual queues on the M5 remain northbound to J20 and southbound to J17. Local diversion routes are also heavy, especially the A4 Portway and the A370. Traffic is stop‑start near Avonmouth and Portbury as flows rebalance after the reopening. Plan extra time through these sections.

How could m5 traffic affect deliveries today?

Expect missed slots, resequenced routes, and late returns to depots serving Bristol and North Somerset. Same‑day and grocery drops face the highest risk. Carriers may cut stop density to protect ETAs, tightening capacity and lifting overtime and fuel costs until queues ease.

Which routes should drivers avoid around Bristol?

Avoid the A4 Portway and A370 during peaks, as both are absorbing diverted flows. Consider the M49–M4 for long‑haul movements if it reduces exposure to J18–J19. Keep an eye on official updates and adjust staging times to avoid arriving at known pinch points during the busiest windows.

What should investors watch over the next 48 hours?

Track on‑time delivery rates, overtime and fuel usage, and any service credits issued for delays. Retailers and parcel carriers serving Bristol may flag short‑term costs. If congestion persists into tomorrow, look for signs of backlog clearance plans and temporary capacity adds in trading updates.

Law and Government

M5 Traffic March 18: Bristol Police Incident Snarls Logistics Routes

ByHuzaifa Zahoor March 18, 2026

M5 traffic is under pressure today after a police incident closed the motorway between J18 (Avonmouth) and J19 (Portbury) on 18 March before reopening. Residual queues stretch northbound to J20 and southbound to J17, with heavy Bristol traffic on the A4 Portway and A370. For investors, M5 traffic now raises short‑term risks to last‑mile deliveries, driver hours, and cost per drop across the Bristol and North Somerset corridor. We outline the operational picture, near‑term impacts, and practical steps for logistics‑exposed businesses.