Parish Roads in Louisiana include all public roadways that are controlled and maintained by the local government of the parish in which they are located. The existence of a system of parish roads signed as touring routes varies greatly by parish. To most motorists in Louisiana, the only visible parish roads with numerical designations are the few that appear on state-maintained signage at various Interstate Highway exits. This list includes all nine instances where a parish road intersects an Interstate Highway and features MUTCD standard signage installed by the Louisiana Department of Transportation and Development (La DOTD), the state's highway agency. It also includes several examples of parish roads that are signed by the state due to their proximity to an Interstate Highway or their status as part of an interstate frontage road. Caddo Parish Road 16 Caddo Parish Road 16 (PR 16) runs in an east–west direction from LA 1 north of Myrtis to US 71 in Mira. It is locally known as Mira Myrtis Road. PR 16 is only signed from intersecting state highways by La DOTD. The designation is most visible on the exit signage for its interchange with I-49 at Mira. The posted speed limit is . DeSoto Parish Road 16 DeSoto Parish Road 16 (PR 16) runs in a general northwest to southeast direction from the junction of I-49 and LA 3276 in Stonewall to LA 175 in Frierson. It is locally known as Stonewall-Frierson Road. PR 16 is only signed at the I-49 interchange by La DOTD. The posted speed limit is . Lincoln Parish Road 106 Lincoln Parish Road 106 (PR 106) runs 1.59 miles (2.56 km) in a north–south direction from the junction of LA 818 and LA 150 between Grambling and Ruston to LA 544 northwest of Ruston. It is locally known as Tarbutton Road. PR 106 is signed at its interchange with I-20 west of Ruston. It is also signed by La DOTD immediately north and south of this interchange, though no signage has been posted on the state highways that PR 106 connects to. PR 106's interchange with I-20 was completed and opened to the public in June 2020. Construction for the $25.5 million project began in 2017 and has been planned as far back at the 1990s. This route was likely signed at the same time with the interchange's construction. Livingston Parish Road 45 Livingston Parish Road 45