There will be a mock fire at a tyre site in Hampshire later, as part of an emergency exercise by Hampshire Fire and Rescue Service.
Firefighters, police officers, council workers and the Environment Agency will be involved in the exercise near Romsey.
To make the exercise realistic several roads will be closed between 18:00 and 22:00.
- A3057 Romsey Road between M271 junction and A27 junction.
- Coldharbour Lane, Hoe Lane, Toothill Road, Lee Drove and Lee Lane.
- There will be diversions put in place between A27 Luzborough Lane and A27 Botley Road.
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A further 85 buses are expected to arrive on Tuesday and Wednesday, with officials saying the entire operation will last at least a week.
The government will make an announcement about whether Heathrow or Gatwick should be awarded a new runway at 12.30pm today.
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