According to the Swiss Local Tagging scheme,

- only highways signed in blue ((1st class roads (blue signs with nummer), transit route,) and (2nd class roads (blue signs))) may be tagged a primary respectively secondary highways. - all white signed highways (communication road (white signs) ) are tagged tertiary. - all other transit highways are tagged unclassified.

I believe if we are to consistently follow this schema, then many highway will require re-classification in NW Switzerland. I have started re-surveying streets that I have tagged so see how they are signed (blue, white, none) and correct my previous mapping.

I have found the Liste der Hauptstrassen at http://www.admin.ch/ch/d/sr/741_272/app2.html helpful in determining if a blue signed highway should be tagged primary or secondary. I include an extract of NW CH Hauptstrassen, for your reference.

Hauptstrassen, die mit der «Nummerntafel für Hauptstrassen» (4.57) gekennzeichnet sind

2. (Burgfelden)–Basel–Muttenz–Liestal–Sissach–Olten–Zofingen– Dagmersellen–Sursee–Luzern–Küssnacht–Arth–Seewen–Ibach–Brunnen–Göschenen–Andermatt–St. Gotthard–Pass Motto Bartola–Airolo–Bellinzona–Lugano–Chiasso–(Como) 3. (Weil)–Basel–Stein–Frick–Brugg–Baden–Zürich (Berner Strasse)– Wädenswil–Pfäffikon–Näfels–Murg–Walenstadt–Sargans–Chur 7. (Weil)–Basel–Stein–Laufenburg–Koblenz–Zurzach–Kaiserstuhl–Winterthur–Wil–St. Gallen–Rorschach–St. Margrethen–Rheinstrasse–Landesgrenze (Zollamt)–(Bregenz) 12. Vevey–Bulle–Posieux–Fribourg–Bern–Solothurn–Balsthal–Langenbruck–Liestal–Muttenz–Basel–(St–Louis) 18. La Chaux–de–Fonds–Saignelégier–Glovelier–Delémont–Laufen–Basel–(Weil) 24. Sursee – Schöftland – Aarau – Staffelegg – Frick

Hauptstrassen, die nicht mit der «Nummerntafel für Hauptstrassen» (4.57) gekennzeichnet sind

267 Kleinlützel–Laufen–Breitenbach–Büsserach–Passwang–Mümliswil– Balsthal (SO–BE) 272 Breitenbach–Reigoldswil–Bad Bubendorf (SO–BL) 273 (Leymen)–Flüh–Bättwil–Aesch–Dornachbrugg–Münchenstein (Schwertrain)–Basel (SO–BL–BS) 274 Röschenz–Challhöhe–Metzerlen–Mariastein–Flüh–Bättwil–Biel–Benken–Oberwil–Binningen (BE–SO–BL) 275 Anschluss N 3 Rheinfelden–Rheinfelden–Riburg–Möhlin (AG) 276 Kienberg–Wittnau–Frick (SO–AG) 305 Bottmingen–Münchenstein–Muttenz–Birsfelden (BL) 306 Pratteln–Schweizerhalle (BL) 307 Sissach–Zunzgen–Diegten–Eptingen (BL) 308 Pratteln (Hülften)–Augst (BL) 308.1 Liestal–Arisdorf (BL) 309 Sissach–Gelterkinden–Ormalingen–Rothenfluh–Anwil–Kienberg (BL–SO) 310 Biel–Benken–Reinach–Dornachbrugg–Dornach (BL–SO) 311 Therwil–Binningen–Basel (BR–BS) 312 (Hegenheim)–Allschwil–Basel (BL–BS) 313 Ettingen–Therwil–Oberwil (BL) 314 Reinach–Arlesheim (BL) 317 Basel–(Grenzach) (BS) 318 Basel–Riehen–(Lörrach/Stetten) (BS) 319 Basel–(Weil/Friedlingen) (BS) 320 Basel–(Hüningen) (BS) 322 Riehen–Bettingen (BS) 322 Riehen–Bettingen (BS) 324 Riehen–(Weil) (BS)

Happy mapping Steven Long