Challenge #1
![](medias/challenge/carrieres.jpg)
The aggregates Challenge :
quarries, sand production industry, concrete power plants, recycling plants, suppliers and equipment dealers, engineers, students, representatives, drivers, mechanics...
Challenge #2
![](medias/challenge/construction-et-ouvrage-dart.jpg)
The Grand Paris construction and infrastructure builder Challenge :
contractors, suppliers, drilling and special foundation companies, design office, equipment dealers, engineers, students, representatives, drivers, mechanics...