YANKTON, S.D.(WNAX)- The South Dakota Department of Transportation is working on a multi-phased Interstate 29 corridor study in southeast South Dakota.

Steve Gramm is the planning squad leader for the project.

Gramm says development has driven a traffic increase in that corridor.

Gramm says public input on the study is very important.

Gramm says they would like people to take an online survey by May first.

The study is due to be finalized by next spring with any construction targeted from 2030 to 2040.