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- Leighton Buzzard Road in Hemel Hempstead was closed as police responded to a crash.
- One vehicle was involved.
- Herts Police told motorists to avoid the area and expect delays.
- Two southbound M1 lanes were then closed after a separate vehicle breakdown.
- There were delays of one hour against expected traffic, according to National Highways.
- Roads in and out of Hemel were reportedly "extremely busy" as people sought alternative routes.
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