Here are some potentially lifesaving items to have in the car. Some should be kept where the driver can reach them, while others can be stored safely in the back for when you need to pull over and wait until it is safe to travel again.
At arm's reach
The safest choice is to avoid the risk of floodwater completely, however an emergency hammer, waterproof torch and foil blanket can help if you get stuck or trapped in your vehicle. They should be kept where the driver can reach them. If your windows stop working, breaking them is almost impossible without a vehicle emergency hammer.
In the boot
Keeping a vehicle emergency kit in the boot will mean you are prepared for the unexpected. Be sure to pack: a first aid kit, bottled water and long-life food, toilet paper, a blanket, toolkit, tarpaulin, torch and batteries, a shovel and tow rope (if your car is equipped for towing.)