Roofing Contractor,http://www.roofingcontractor.com/quiz/test-your-ladder-safety-knowledge#.Vz3IcoErqhA. , is offering monthly safety knowledge quizzes. This month’s Test Your Knowledge quiz covers ladder safety. Each one of our crew member’s will be taking this short quiz tomorrow just as a reminder or refresher. The crew leaders will discuss ladder safety in detail with their crews.