The Lytle Tunnel is a vehicular tunnel that carries Interstate 71 (I-71) under the historic Lytle Park in Cincinnati, in the U.S. state of Ohio, connecting Fort Washington Way to the Northeast Expressway. It is a six-lane tunnel with three tubes. There is a two-lane southbound tube, a three lane-northbound tube, and a one-lane southbound tube that separates from the highway and serves as an exit ramp to the downtown area. The tunnel is ventilated by two grates in the northbound tube and the southbound exiting tube. It was completed in 1970. At 335 meters, it is the longest vehicular tunnel in Ohio. It is also the only tunnel on I-71.