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In Tamil Nadu, there is a separate Highways Department (HD) which was established in April 1946 and renamed as Highways & Minor Ports Department (HMPD) on 30 October 2008. HMPD of Tamil Nadu is primarily responsible for construction and maintenance of roads including national highways, state highways and major district roads in Tamil Nadu.

Roads with traffic density less than 10,000 PCUs but more than 5,000 PCUs are designated as major district roads (MDR). MDRs provide linkage between production and marketing centres within a district. They also provide connections between district and taluk headquarters with the state highways and national highways. Construction and maintenance is carryout by the Highways Department for MDR along with state highways and ODR. These roads have a minimum width of 15 meters.

Lane wise distribution

Details of lane wise distribution of MDR roads in Tamil Nadu as of March 2013:

List of MDRs

List of Major district roads in Tamil Nadu (as of March 2019).

MDR 1 to MDR 100

MDR 101 to MDR 200

MDR 201 to MDR 300

MDR 301 to MDR 400

MDR 401 to MDR 500

MDR 501 to MDR 600

MDR 601 to MDR 700

MDR 701 to MDR 800

MDR 801 to MDR 900

MDR 901 to MDR 1000

MDR 1001 to MDR 1100

MDR 1101 to MDR 1200