Based on the Mornant (69) industrial estate, MGB is a public works company whose specialty is road works.  It has 110 employees 80 of whom work on the sites. MGB operates its own coating production unit, EOL (Enrobés Ouest Lyonnais[West Lyon Surfacing Materials]), several recycling units at Mornant, Longes and Vénissieux (69)  through its subsidiary, CCC (Carrières Combe Chavanne) and has access to SERFIM Route’s 6 alluvial and solid rock quarries. Sales of €21.7 were posted in 2014.

Its road surfacing fleet and 14 teams enable the firm to carry out any type of road work. Its installations are grouped together on a 39,000 m² site at Mornant. MGB combines independence with performance and can rapidly set up works due to its proximity to several major routes such as the A7, A46, A47 and A450.