Drivers are being urged to watch their speed and consider the conditions while travelling around Norfolk after four cars were involved in separate incidents this morning.

The warning for drivers has come from the East of England Ambulance Service after paramedics were called out to crashes across our region.

A car overturned in Hollow Hill Road, Ditchingham, near Bungay, at 4.36am and resulted in one person being taken to the Norfolk and Norwich University Hospital.

An hour later, paramedics took a man in his 20s to the same hospital with shock after his car rolled into trees along Beccles Road, in Hales.

In Snettisham, a woman in her 20s was trapped in her car after it came off Bircham Road at 8.24am and ended up in a ditch but she was not injured in the incident.

At 9.10am a car then overturned at Whealey Bank, in Walton Highway, near Wisbech and a woman in her 30s was taken to the Queen Elizabeth Hospital after being rescued from her vehicle.

Gary Sanderson, a spokesman for the ambulance service, said: 'Unfortunately we have attended several road traffic collisions today due to the fog and icy conditions.

'The temperature is already below freezing and with fog falling fast it will make the visibility for driving very difficult.'

'We are urging drivers to allow plenty of time for travelling and watch your speed.

He added: 'Simple tips such as allow plenty of time for braking, drive safely and pay attention for motorcyclists and pedestrians. This will help you arrive at your destination safely.'

Norfolk Police said it received 45 calls relating to crashes around Norfolk yesterday morning and afternoon but only four in West Norfolk and two in South Norfolk mentioned icy roads.

A spokesman added: 'Make sure all your car lights are working and you have no failed bulbs. Ensure that dirt, salt and snow is cleared away from light fixtures.

'Always ensure all windows are fully cleared of snow, frost and condensation before setting off on a journey - it is illegal to drive with obscured vision.

'Also clear snow from the top of the car as this can fall down and obscure your windscreen while you are driving.

'Keep windscreen washer fluid topped up as windscreens quickly become dirty from traffic spray and salt from the roads and make sure you have sufficient fuel for your journey. Keep the fuel tank topped up.

'Give yourself extra time for your journey and drive at a constant speed. Accept your journey will take longer, don't take risks and take a mobile telephone with you, making sure it is fully charged. Carry a mobile charger in the car.'

A Norfolk County Council spokesman confirmed gritters will be out treating the roads from 6pm but will be on standby this evening if conditions get worse.

But those travelling to and from Carrow Road this evening for Norwich City's Capital One cup clash against Aston Villa shouldn't have too many problems.

Phil Garner, from Norwich-based Weatherquest, said: 'It's going to be cold this evening but it will be dry and clear all the way through the game.

'The air is just so dry at the moment that there won't be ice or frost and the paths and pavements running up to the ground will be ok.'

He continued: 'Temperatures during the game will fall close to below freezing so a good scarf, hat and thick coat are in order for those going to Carrow Road tonight. But hopefully there will be enough excitement to keep the fans warm.'

Meanwhile Andrew Howard, AA head of road safety, said: 'The big things are, firstly, to give yourself more time, slow down, give yourself more room and remember others aren't as sensible as you.

'Blockages on the road from other vehicles can cause traffic queues so you need to be wrapped up warm if you are going to be stuck on the roadside for two hours.'

Simon Williams, RAC spokesman, added: 'Drivers should leave plenty of time for their journey and be well prepared and take a bit of drink and food just in case the worst happens.'