You might have noticed these newly-installed posts bearing the number “850” along the national road. The number indicated actually refers to a specific route number based on the new route numbering system being implemented by the Department of Public Works and Highways (DPWH) throughout the country.In the province of Bohol, these specific routes are numbered 850, 851, 852, 853 and 854.
Trinidad – Clarin – Tagbilaran – Loay (850)
Trinidad – Carmen – Ubay (850)
Trinidad – Carmen – Loay (852)
Here is the map for your reference.
Route numbering is easy to remember because many road names are usually changed in honor of a person or event of historical importance of a locality.