Labor One Mobile Training Unit Labor One is a mobile classroom that brings safety and health training straight to the work site. The 35-foot training unit will travel to any work site in the state and provide free, hands-on training on a variety of safety and health topics. The classroom has a maximum capacity of 20 people. “Big 4” Hazards in Construction: Falls, Struck-by, Crushed-by and Electrical Fall Protection Electrical Hazards Scaffolding Trenching and Excavations Ladder Safety Personal Protective Equipment Request Labor One Businesses can request a visit from Labor One by filling out the online registration form. A 30-day notice is preferred, but arrangements may be made closer to the requested training date depending on scheduling. Training classes require a minimum of 10 participants. Multiple businesses—such as subcontractors on a construction site—may combine their employees to meet the minimum requirements. Most sessions require one hour per subject, however, training sessions may be modified if necessary.