Hazardous Materials
Hazardous Materials, called HAZMAT in ATS, permits the driver to carry dangerous goods. The skills source describes it as one of the abilities improved through level-based skill points.
How it works
The companies source says chemical-company jobs most often require an ADR license, while some trailers are available to less experienced drivers. This makes the skill relevant to hazardous-goods work, but the evidence does not specify ranks, thresholds, or every eligible load.
When it helps
Consider it when you want access to dangerous-goods work.
Read the supporting references
Career progression through driver skills, garage capacity, and hiring. The supplied evidence gives little detail about truck-component effects. Guidance explains the referenced mechanics; it is not a tested damage ranking. Check the stated edition and source version before applying a patch-specific detail.