The Met Office has issued a yellow weather warning for ice covering a large area of Sussex, north of the South Downs.
The warning covers the period from 4am to 10am today (Monday 8 January).
The official forecaster warned of “icy patches and wintry showers affecting some areas on Monday morning, leading to potentially slower journeys”.
It added: “Some roads and railways are likely to be affected by ice and in a few places by snow, leading to longer journey times.”
There would “probably some icy patches on some untreated roads, pavements and cycle paths, making accidents or injuries more likely”, the Met Office added.
The warning, issued yesterday, said: “A mix of sleet and snow showers will move in from the east later on Sunday night along with temperatures near zero.
“Given these wintry showers and also wet surfaces after recent wet weather, some icy patches are likely on untreated surfaces.
“Additionally, a few of the snow showers could turn quite heavy, these probably only affecting a narrow zone, but a few places could see 1cm to 3cm, mainly over the north Downs and on grassy surfaces.”
“Keep yourself and your family safe when it is icy or small amounts of snow have fallen.
“Plan to leave the house at least five minutes earlier than normal. Not needing to rush, reduces your risk of accidents, slips, and falls.
“If you need to make a journey on foot, try to use pavements alongside main roads which are likely to be less slippery.
“Similarly, if cycling, try to stick to main roads which are more likely to have been treated.”