The wings of Highways Department are as follows:
- Office Of Director General - Overall Coordination
- Construction & Maintenance wing - State fund works
- National Highways wing - Central fund works
- NABARD & Rural Roads wing - NABARD loan assisted projects
- Projects wing - ROB/RUB/HLB/By Passes
- Metro wing - Major Infrastructure Projects Works in CMA
- Tamil Nadu Road Sector Project - World Bank assisted projects
- Planning, Designs & Investigation Wing - DPR preparation for Major Works
- Highway Research Station Wing - Quality Assurance, Research and Training Activities
- CKICP - Asian World Bank Assisted Projects
- CPRR - JICA Assisted Projects
In addition, two companies are executing Special Projects.