Hundreds of firefighters, family and friends attended a memorial service for firefighter Stephen Hunt.
It's exactly a year since the 38-year-old died battling a blaze in Manchester's Northern Quarter.
Victoria Grimes reports.
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Drivers are being advised to use alternative routes or wait until 8pm before setting off to avoid the worst queues.
Officers say they are growing increasingly concerned about missing Kristina Kazlauskaite - who used to lived in Old Trafford and Burnage.
In a message marking the fire as "one of the toughest days in (our) long history" the zoo said insects, frogs, fish and small birds died.