| Country | Class(es) | Source | Format/remarks |
| Asia | Asian highways | Marcel Monterie | |
| Australia | Queensland A roads | Marcel Monterie | |
| Austria | All roads | Austrian Parliament, Bundesstraßengesetz | |
| Bangladesh | National highways | Marcel Monterie | |
| Belgium | Motorways | Erwin Gavic | |
| A, B and R | Marcel Monterie | ||
| 1- and 2-digit numbers before 1986 | Rien van de Wall | ||
| Brazil | Federal highways | Ministério dos Transportes | Select Rodovias Federais |
| Canada - Ontario | Provincial Highways | Christopher J Bessert | Includes history |
| Canada - Québec | Autoroutes | MADITUC | |
| Routes Principales | 1xy | ||
| Routes Secondaires | [23]xy | ||
| Croatia | All roads | Marcel Monterie | |
| Estonia | All roads | Estonian road administration | Excel |
| Europe | E roads | Marcel Monterie | |
| Finland | Valtatie/ Kantatie/ Maantie | Marcel Monterie | |
| France | Motorways | Marcel Monterie | |
| Routes Nationales | |||
| Germany | Motorways | Marcel Monterie | |
| Motorways in the GDR (DDR) | Robert Schoder | ||
| Bundesstraßen | Rainer Prigge | Including history | |
| Bundesstraßen | Carsten Wasow | Including history | |
| Roads in Bayern | Bayerisches Staatsministerium des Innern | ||
| Greece | Main roads | Marcel Monterie | |
| Ireland | Regional roads | Marcel Monterie | |
| Local roads | |||
| SN roads | |||
| Italy | Motorways | Eugenio A. Merzagora | A |
| Link roads | D and R | ||
| Japan | Main roads | Marcel Monterie | |
| Latvia | Latvian State Roads | Latvian state roads | |
| First class Roads | |||
| Second class Roads | |||
| Lithuania | All roads | Lithuanian road administration | pdf - Select Lietuvos keliai (Lithuanian roads) > Keliu tinklas (Road network) |
| Luxembourg | Motorways | Erwin Gavic | |
| Malaysia | Expressways and highways | Wikipedia | |
| Mashreq | Mashreq international roads | Agreement on international roads in the Arab Mashreq | |
| Netherlands | All roads | Marcel Monterie | Updated 2002 |
| All roads | Erwin Gavic | ||
| Poland | Main roads | Ministerstwo Transportu i Gospodarki Morskiej | |
| Slovenia | All roads | Direkcija RS za ceste | |
| South Africa | Main roads | Marcel Monterie | |
| Spain | A roads | Marcel Monterie | |
| Switzerland | Nationalstrassen | Durchgangsstrassenverordnung, Bundesrecht | For administration only |
| Hauptstrassen | |||
| United Kingdom | A roads | Marcel Monterie | Including Man and Jersey |
| United States | Interstate highways | Federal Highway Administration | |
| US highways (1997) | Marcel Monterie | ||
| US highways | Robert V. Droz |