This bill mandates the New Hampshire Department of Transportation to install and maintain mile markers along Route 112, also known as the Kancamagus Highway, specifically from the town of Lincoln to the town of Conway. Additionally, the department is permitted to install mile markers along another segment of Route 112, from the town of Bath to the town of Woodstock. The mile markers are to be placed at regular intervals of no more than one mile, ensuring they are visible and legible for both motorists and emergency personnel, although markers may be omitted in densely developed areas. The department is also required to maintain these markers in accordance with federal guidelines and to consult with local officials regarding their design and placement prior to installation.

The bill does not allocate specific funding for the project, but it is estimated to incur a total cost of approximately $287,600, which will be funded through federal highway funds. The implementation of the mile markers is expected to begin after July 1, 2025, with construction anticipated to take place primarily during the 2026 construction season. However, the bill's funding will displace other programmed projects, potentially delaying necessary sign improvements on existing highways. The act will take effect 18 months after its passage.