After around 3 weeks of some discussion in GitHub about redefining road classifications for the Philippines, I came by a polished proposal, which can be summarized as:
- Motorway - expressways. Implies legal traffic restrictions under the Limited Access Highway Act. Implied speeds: 100 (maximum), 80 (maximum for trucks and buses), 60 (minimum) - Trunk - major national transportation backbone routes connecting key cities; expressway segments where not grade-separated, implied legal traffic restrictions do not apply (e.g. motorcycles below 400cc explicitly permitted). Typical speeds: 80 (rural), 60 (urban) - Primary - (rural) roads of regional importance, connecting large municipalities and other cities with each other and the trunk network. Usually a secondary national road, or 3-digit route; (urban) major arteries, usually secondary national roads. Typical speeds: 80 (rural), 60 (urban divided or multilane undivided), 40 (urban two-lane) - Secondary - (rural) roads that connect smaller municipalities with each other and the primary network, or roads that connects cities and municipalities with each other without traversing the primary or trunk networks: (urban) minor arteries, usually those that connects 3+ barangays or city districts. Typical speeds: 60 (rural), 40 (urban) - Tertiary - (rural) roads that connects other barangays with each other and the secondary roads; (urban) collector roads or major local streets, usually within 1 or between 2 barangays or city districts. Typical speeds: 40 (rural), 30 (urban). Usually follows more winding alignments and have traffic calming measures to discourage through traffic. - Unclassified - (rural) minor roads which neither fit any of the classes above and residential; (urban) minor mixed-use or non-residential road. Speed: 30 (rural), 20 (urban) - Residential - roads specifically used to access houses. Speeds: 20, 30 (in some places where streets have sidewalks. must be indicated by signage) - Service - unnamed access roads around buildings or private property, parking lot roads, long private driveways, drive-thru lanes. Typical speeds: 10-20 km/h - Living street (considered for dropping, but there is some consensus to keep it, however with a narrower definition that better reflects the reality since the road clearing operations that make a redefinition necessary) - narrow streets where two-way traffic cannot pass smoothly, and vehicles must travel very slowly, approximately at the same speed as pedestrians. The proposal largely borrows some of the principles that are used on the road classification guidelines for Canada and Australia, such as functional types, but with adaptations to the Philippine context. The main goals of the revised road classifications are to distinguish between urban and rural roads (which the existing classification system have failed to do due to its apparent bias toward urban roads), improve routing by creating a general road hierarchy, and at a lesser extent, reflect the official road classification (which now includes functional info since around 2014, but for OpenStreetMap purposes, just one criterion to consider the correct classification of some roads). In the previous guideline, I see the definition of the primary classification as too broad, and in regards to towns served, a primary should better serve the largest ones, usually a regional economic or tourist center. Since some roads lie in a gray area in OSM's road classification system, there is a set of criteria that are useful when to consider a change in classification of a certain road or road section. In general, the functional type is the most important determinant of the OSM road classification, but some other criteria can also influence it.: * Functional type (controlled-access highway/major transportation backbone/regional highway/major artery/local highway/minor artery/collector/local road) - can be determined through usual traffic patterns * Official classification (Expressway/National Primary Road/National Secondary Road/National Tertiary Road/Provincial Road/others) * Size (two-lane undivided, multilane undivided, divided) * Speed (higher speeds = consider upgrading, lower speeds = consider downgrading. Generally useful when to distinguish between secondary and tertiary, or tertiary or unclassified/residential.) Since the most important details of the proposal are provided, it is time now for anyone to provide any further comments and discussion just before this can be published on the Philippine mapping guidelines at the wiki. --TagaSanPedroAko--
_______________________________________________ talk-ph mailing list talk-ph@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-ph
