Automatic traffic cone-laying lorries are to be deployed on the M25 motorway to reduce the risk of road workers being injured.The “automated cone laying machines” were unveiled on Wednesday by construction company Balfour Beatty after several years of trials.They can lay a cone in less than 10 seconds – and can also collect them after the completion of road works.It is unknown how many road workers are killed or injured on UK roads but there are around 175 “incursions” a month into work sites by motorists. Efforts are being made to reduce the risks that many workers face.