The best I can piece together, as a layperson reading state statutes, is because the NH Division of Historical Records[1] was assigned a duty and a budget to pr

The best I can piece together, as a layperson reading state statutes, is because the NH Division of Historical Records[1] was assigned a duty and a budget to preserve and disseminate information on NH history [2]. The NH Historical Marker program is a joint effort with the NH Department of Transportation, and it is the responsibility of the DOT to erect and maintain the signs after approval from the Division of Historical Records [3]. The DOT has authority to erect these signs on class I-III roads which are state owned and maintained [4]. There appears to be a separate statute governing the installation of markers along class IV and V roads which are maintained by cities and towns [5]. [1]https://www.nh.gov/nhdhr/about.html https://www.nh.gov/nhdhr/about.html [2]http://www.gencourt.state.nh.us/rsa/html/XIX/227-C/227-C-4.htm http://www.gencourt.state.nh.us/rsa/html/XIX/227-C/227-C-4.h... [3]https://law.justia.com/codes/new-hampshire/2015/title-xx/chapter-236/section-236-41 https://law.justia.com/codes/new-hampshire/2015/title-xx/cha... [4]http://www.gencourt.state.nh.us/rsa/html/XX/236/236-40.htm http://www.gencourt.state.nh.us/rsa/html/XX/236/236-40.htm [5]http://www.gencourt.state.nh.us/rsa/html/XX/236/236-44.htm http://www.gencourt.state.nh.us/rsa/html/XX/236/236-44.htm