The authority is concerned for the safety of tourists who stop their cars "anywhere" to photograph the dramatic scenery of the region, reports broadcaster NRK.
"They often stop in places that are not easy to see, and when everyone in the car gets out to take photographs, dangerous situations for traffic can result," NPRA department director Jørn Simonsen told NRK.
Nordland Police district receives on a daily basis reports of unsafe driving and dangerous situations involving tourists, according to the report.
"We have now bought vests so that all passengers will have access to them," Simonsen said to NRK.
The traffic agency is also working on a road safety information booklet that will be translated into several languages, the broadcaster reports.