BAM Nuttall, Skanska, Laing O’Rourke and John Henry are now using the MyZone system on some of their sites following its earlier introduction by Balfour Beatty and John Sisk.

Network Rail, Amey, Balfour Beatty and Carillion are also trialing the system in the rail sector.

The MyZone worker alert sounds a warning when workers get near heavy plant or other potential dangers on site.

The alarm is fitted inside hard hats and creates an “exclusion zone” around workers.

The safety system has spread across the industry after being featured in the Enquirer last year.

MyZone is now going global after securing a seven-figure investment sum from Australia.

Drew Murray, C.O.O. of MyZone manufacturer TI Global said there had also been interest from companies as far afield as Hong Kong, Kuwait and the USA.

He said: “This is such a simple concept but one that requires complex technology and large investment in R&D.

“This added funding is particularly welcome at a time when some of the most influential companies in the construction and rail industries are adopting MyZone as an addition to their PPE to address one of the biggest safety concerns on any site.”