MOTORISTS should never drive faster than 20mph on loose chippings where roads have been resurfaced.
And they should never try to overtake any other vehicles.
The warning comes from both the police and Kirklees road engineers as contractors working for Kirklees Council get into full swing on resurfacing roads across Huddersfield.
Two serious accidents - one fatal - have already happened on roads that had been resurfaced in the last three weeks.
Both accidents are being investigated.
Information technology consultant Paul Anthony Meany, 41, died when his car was in a head-on crash with a lorry on Wakefield Road, Grange Moor, on May 12.
And last Tuesday evening, a 20-year- old Honley man was critically injured when his car crashed on Huddersfield Road, between Netherton and Meltham.
Now, a warning about driving over loose chippings has been put out.
A Kirklees spokesman said: "Warning signs are always put out when roads are being resurfaced with stone chippings - and people should heed them.
"The speed limit over loose chippings is usually 20mph, but it can sometimes drop to 10mph."
Roads are chipped in a process known as surface dressing, as part of a rolling road improvement programme.
Chippings are especially used after roads have become worn and the skid resistance on them is reduced.
They also seals roads against the risk of water getting in and causing potholes.
A film of bitumen is spread across the road and stone chippings are then spread across it. They are then pushed through the bitumen and into the original road surface by a pneumatic wheeled roller.
In Kirklees, the process is only carried out between May and the end of the summer, because the original road surface is softer and the chippings will go into it.
The spokesman said: "Once the roller has compressed the chippings the road is opened to vehicles again, with signs warning of speed restrictions.
"The vehicle tyres bed the chippings in further. Within 24 hours any loose chippings that have not been embedded are swept away.
"The signs are left up another week, in case any chippings come loose before the road is swept again. People should drive very carefully over chippings."
In Kirklees, about 40 miles of roads get a new surface dressing each year, at a cost of £500,000.
The spokesman added: "The roads vary from main ones to small country lanes."
Pc Peter Doyle, of Huddersfield traffic police, said: "Warning signs are out for a very good reason and we would urge people to stick to what they say.
"They should keep to the speed restriction and not overtake, as the excess loose chippings end up in the centre of the road. It's then like driving on snow."