HMID Standards
The High Mast Illumination Details (HMID) standard
sheets contain the specifications and details for the structural,
mechanical, and electrical parts of TxDOT's standard high mast lighting
assemblies. It includes details for the ring, ring supports, lowering system,
and other mechanical and electrical systems needed to construct
a complete assembly. The HMID sheets should be included in the plans
whenever high mast lighting assemblies are used on a project.