First road plans and
Vilar Formoso. Completed in the 1930s as the National Road 8 of 1st class (EN 8-1ª), it became the National Road No. 16 (N 16) under PRN 1945. For decades, this was the most-direct road link between Portugal and the rest of Europe. paved in granite blocks which were typical of the original national roads in Portugal. The first road plans in
Portugal date back from 1843 and 1848, and were based on 18th century plans which prioritized connections between
Lisbon and strategic points of the country, and as a support for
fluvial routes. The planned network was classified in 1850 into
estradas (roads) and
caminhos (paths), with the
estradas being classified as 1st and 2nd class.
Caminhos were routes of merely local interest. In 1862, the existing and planned roads were classified as 1st class roads or
estradas reais (royal roads), 2nd class roads or
estradas distritais (district roads), and
estradas municipais (municipal roads). The
estradas reais were those with direct or indirect (via railways, for instance) origin in
Lisbon and were managed by the State. The
estradas distritais were managed by the
districts while
estradas municipais were managed by the
municipalities. With the abolition of the monarchy in 1910, the
estradas reais were renamed
estradas nacionais (national roads). In 1913, the Law of 22 February established a commission to study a new classification of the roads and propose guidelines to establish that classification. However, despite these efforts, many
routes were not clearly classified and the condition of most roads was chaotic. Widespread use of the
automobile in the 1920s created new pressure for reforming the Portuguese road network. In 1926, under the
Ditadura Nacional regime, a provisional General Plan of National Roads of 1st and 2nd class was established by Decree 12,100 of 31 July 1926, according to what was previewed by the Law of 22 February 1913. Both the 1st and 2nd class roads would be designated
estradas nacionais, with the term
estrada distrital disappearing. They were designated EN xx-x (for
estradas nacionais followed by the number of the road and its class). This plan established 23 roads of 1st class (designated EN 1-1ª to EN 23-1ª) and 112 roads of 2nd class (designated EN 1-2ª to EN 112-2ª). It kept the 23 1st class roads and the 112 2nd class ones, but some roads were rerouted, extended, or truncated. The 1st class national roads included in the 1928 General Plan of National Roads were the following: In 1933, roads were reclassified as
estradas nacionais (1st and 2nd class),
estradas municipais and
caminhos públicos (public paths), with the latter two under municipal management.
1945 National Road Plan ring road and a first-class National Road according to PRN 1945. It is to be converted into a
boulevard. –
Vila Real de Santo António) was a 1st-class National Road. . In 1933, the entire (i.e. built and planned) network of national roads totalled . The
state recognized the importance of the road network and, in 1945, created the first real national road plan, the
Plano Rodoviário Nacional de 1945 (PRN 45), defined in Law No. 34,593 of 11 May 1945. This plan comprised a national road network of . PRN 1945 classified the national road network in
Rede Fundamental (Fundamental Network) and
Rede Complementar (Complementary Network). The latter served to support the fundamental network. Roads were classified according to the following: •
Fundamental Network: Estradas nacionais (
EN or
N) •
1st-class roads: • Principal routes (
itinerários principais): to • Other first-class roads: to •
2nd-class roads: • to •
Complementary Network: Estradas nacionais (
EN or
N) •
3rd-class roads: • to • . Branch roads, emerging from a determined road, which was identified by
X, with a number of order according to point of origin, identified by
Y. The road with most branch roads was , originally with 16 roads numbered to . (In 1961 and were renamed as and , respectively. However, later and were created, so N 1 resumed the record for 16 branches). These roads were planned to cover distances rarely longer than , closing some road grids, and connecting locations of some demographic importance which are not covered by the "parent" road such as less-important border crossings, railway stations, and seaports. There were 438 branch roads. The National Roads Statutes were subsequently approved in 1949. In 1961, separate legislation (Law No. 2110 of 19 August 1961) on municipal roads defined new guidelines on construction, maintenance, and commercialization of these roads, and those were classified as following: •
Estradas municipais (
EM or
M): • –, following a district sequence, so the sequence 501 and over was repeated in every district. Municipal Roads could have also Branch Roads, following the same rules as for National Roads •
Caminhos públicos or, from 1961,
caminhos municipais (
CM) • and on, with the same numbering rules as Municipal Roads The Main Roads could be, by law, upgraded to 4
lanes with
central separation, if necessary. In fact this happened before PRN 1945, with the
N7 motorway (now the
A5) between
Lisbon and the
National Stadium completed in 1944, and in 1961 with the first of
N1 motorway (now
A1) between
Lisbon and
Vila Franca de Xira. The first urban highways were built in the 1960s. Nevertheless, most motorways built before 1985 had no number at all. The road classes were distinguished using colour codes: red for first class, blue for second class, green for third class, yellow for municipal roads, and brown for municipal paths. These colours were applied as the basis of the
location markers and occasionally in the background of the road numbers. The numbering distribution for main roads was according to the importance of its route in the network, and for
N101 and over were numbered in a north-to-south fashion. The length of the roads had no relation with its class (except for branch roads, which were usually short), with existing 3rd-class roads longer than , and main roads with as short as , like the
N7 highway, now part of
A5. The longest road of the 1945 Plan was
N2, connecting
Chaves to
Faro, extending for . According to PRN 1945, there were 18 Main Roads, designated
N1 through
N18.
1985 National Road Plan , was originally signed as IP1. During the 1980s and 1990s, only tolled
highways were typically marked
Axx, while the other highways were signed as
IPxx or
ICxx. From the 1960s, many routes were assumed to be somewhat outdated, so in 1972,
Brisa was created to manage a projected network of motorways, which by that time didn't reach a length of . New sections of motorways were then built in the 1970s and the early 1980s, like the
Vila Franca de Xira–
Carregado (1977),
Carregado–
Aveiras de Cima (1980),
Condeixa-a-Nova–
Mealhada (1982, which permitted bypassing the city centre of
Coimbra),
Santa Maria da Feira–
Carvalhos (1980) and
Albergaria-a-Velha–
Santa Maria da Feira (1983) sections; these would become part of the
A1 motorway and the extension of the
A2 motorway into
Setúbal (between 1978 and 1979). However, the whole road network was seen to be increasingly inadequate to properly serving the whole country. While
Portugal was preparing to enter the
EEC, the replacement for PRN 1945 was created by the Law 380/85 of 25 September 1985, the Plano Rodoviário Nacional de 1985 () or PRN 1985. The road network would again comprise the Rede Fundamental (), composed of nine
itinerários principais (principal routes), designated
IP1 through
IP9, which totalized . The non-motorway sections of the
itinerários principais started to be identified with green background direction signs and green background IPx road numbers. In the late 1990s, although the background of the direction signs continued to be green, the IPx road numbers started to be put on red background rectangles. The
itinerários principais was set to be of restricted access, forbidding pedestrian, animal, and bicycle traffic, but exceptions could be accepted, especially for sections resulting from the reclassification of former national roads into IP network. Such a classification was proposed before the publication of PRN 1985. In the early 1980s, the first branches of the future IP routes were built. These were a loop road alternative to N16 between
Mangualde and
Prime (
Viseu) for IP5 route, built in 1983, and another branch built in 1981 that was integrated on the N2 route but later became part of IP3, between
Oliveira do Mondego and
Chamadouro when
Aguieira Dam was built. The road network also included the Rede Complementar (Complementary Network) of 24
itinerários complementares (IC, ) and other roads. The "other roads" were the former PRN 1945 national roads not set to be transformed into IP or IC, neither set for declassification from the national road network. In practice, the "other roads" continued to be signed as
estradas nacionais (N or EN). The Complementary Network was long. The non-motorway roads of the Rede Complementar were signed with white background direction signs. The PRN 1985 established 24
itinerários complementares, designated
IC1 through
IC24, which totalled : The whole network totalled , with about of old PRN 1945 roads being declassified from the national road network. As the PRN 1985 focused mainly on new roads to be built, no clear rules were established for a procedure regarding the old roads that were to be declassified. In practice, most of them continued to be managed by the national road agency, JAE, and continued to be designated
estradas nacionais. Some of them were transferred to the management of local municipalities. Until the early 1980s, the Portuguese motorways did not have a proper number, each being referred to by a name (with some sections that were part of an
estrada nacional also using the respective Nxx number). The existing motorways at that time (all of them managed under concession) started to receive proper numbers of the type
Axx. With the application of the PRN 1985, new motorways were built with a few of them being managed directly by JAE and not under concession like the majority. So, although all motorways were part of an IP or IC, only concessionated ones received the
Axx number (whether tolled or not). This number was signalized and the
IPxx or
ICxx number was disused in the motorway signage. The other motorways – non-concessionated, and therefore, always non-tolled – were signalized with the
IPxx or
ICxx number. Until the 2000s, almost all motorways under concession were tolled, so during that period, a signed
Axx number helped drivers know in advance whether a motorway was tolled. All motorways were signed with blue background direction signs, independently of being part of the Rede Fundamental or the Rede Complementar. In 1993, the reclassification of of roads in the IC network and about into other roads was proposed, but the optimizations of PRN 1985 were only realized with PRN 2000, which was initially proposed in 1996.
2000 National Road Plan (left) and a non-highway IP road (right). In spite of its name, Plano Rodoviário Nacional de 2000 () or PRN 2000 was approved in 1998 and was published by Law No. 222/98 of 17 July 1998. This was essentially an optimization of the previous PRN 1985, with the addition of about of roads into the National Network, and the creation of the Rede Regional (Regional Network) of about of roads, as well as the identification of a Rede Nacional de Autoestradas (National Motorway Network), that, however, overlapped with the IP and IC network. The plan includes of roads. The so-called "other roads" of the PRN 1985 disappeared from the PRN 2000, with the designation
estradas nacionais becoming official again. A new kind of road, the
estradas regionais (regional roads) was also introduced. The Road Network is defined as following: •
Fundamental Network: •
Itinerários principais •
Complementary Network: •
Itinerários complementares •
Estradas nacionais •
Regional Network: •
Estradas regionais (sections of former
estradas nacionais, which take the same numbering, i.e. ER 2 is a section of EN 2, if the road crosses more than one region, separate sections of the former National Road can be part of the Regional Network) •
Rede Nacional de Autoestradas (National Highway Network) •
Autoestradas (always part of IP and IC network) IP and IC roads may have other designations, especially those integrated with the National Highway Network, where the "
A" designation is preferred on
traffic signage, except for some city or suburban highways. Since its approval, the PRN 2000 was updated twice (in 1999 and in 2003). == Current classification according PRN 2000 ==