A28 (Portugal)

A28 (Portugal)
Country	Portugal
Route	28
Length km	180
Terminus a	Viana do Castelo
Terminus b	Vila Nova de Gaia
Regions	Norte
Established	1990s

A28 (Portugal) is a major north–south motorway corridor running along the Atlantic coast of northern Portugal, connecting Viana do Castelo and the metropolitan area of Porto at Vila Nova de Gaia. The route links maritime ports, coastal towns, and inland corridors, forming part of regional transport networks that interface with international corridors to Spain at border crossings and with maritime routes to the Atlantic Ocean. It serves freight flows between the ports of Viana do Castelo, Leixões, and urban centres such as Póvoa de Varzim and Matosinhos.

Route description

The alignment begins near Viana do Castelo and proceeds southward, skirting the estuary of the Rio Lima before passing through or near municipalities including Caminha, Arcos de Valdevez, Ponte de Lima, Viana do Castelo municipality, Monção, Melgaço, Barcelos, Esposende, Póvoa de Varzim, Vila do Conde, Matosinhos, and terminating in Vila Nova de Gaia opposite Porto. Along its course the motorway interfaces with national routes such as the EN13, EN101, and links to the motorway network including the A3, A4, and A41. The roadway crosses significant hydrological features including the estuaries of the Rio Lima, Rio Cávado, and Rio Douro, with notable engineering structures like major bridges and viaducts near Esposende and Fão. The corridor runs adjacent to cultural and heritage sites such as the historic centres of Ponte de Lima, Braga, and Guimarães while providing access to coastal attractions like the beaches of Póvoa de Varzim and the port facilities of Leixões.

History

Planning for a coastal northern motorway intensified in the late 20th century amid national infrastructure initiatives championed by authorities including the Direção-Geral de Viação and later concessionaires. Construction phases coincided with broader investments under the European Union structural funds and national transport plans coordinated with entities like the Ministry of Public Works and the Instituto da Mobilidade e dos Transportes. Sections were opened progressively during the 1990s and 2000s, paralleling upgrades on the A1 and the development of the Port of Leixões expansion projects. The route’s evolution reflected interactions with regional development policies in Norte and urban planning in Porto Metropolitan Area. Key milestones included interchange completions at Barcelos and capacity enhancements near Matosinhos, influenced by collaborations with entities such as the Autoridade da Mobilidade e dos Transportes and concession holders present in Portugal’s road sector.

Junctions and exits

Major interchanges provide connectivity to national and regional arteries: connections to the A3 at junctions serving the Braga corridor; links to the A4 toward Amarante and Vila Real; and intersections feeding the A41 orbital around Porto. Exits give access to municipalities and facilities including Esposende Municipal Stadium, Póvoa de Varzim Marina, Vila do Conde Porto industrial zones, Santo Tirso business parks, and the Leixões Cruise Terminal. Junction numbering and signage conform to standards applied on the national network overseen by authorities such as the Infraestruturas de Portugal and regional traffic management centres tied to the Porto Metropolitan Authority.

Traffic and usage

Traffic volumes vary seasonally and diurnally; commuter and commuter-freight mixes dominate near Porto and Vila Nova de Gaia, while summer recreational peaks occur towards Esposende and Póvoa de Varzim. Freight flows link the Port of Leixões with inland distribution centres in Braga and Guimarães and with transnational corridors to Vigo and Galicia. Traffic monitoring is coordinated with the Autoridade Nacional de Segurança Rodoviária and regional transport observatories, informing capacity management and incident response alongside operators such as toll and service providers active on Portugal’s motorways. Road safety campaigns by entities like the National Road Safety Authority have targeted sections with historical accident clusters near interchange zones.

Tolls and services

Tolling regimes on the corridor have included both traditional barrier systems and electronic tolling interoperable with national networks managed by concessionaires and overseen by the Institute for Mobility and Transport. Services along the motorway comprise rest areas, petrol stations operated by companies such as Galp Energia and Repsol, and service plazas providing food and vehicle services. Access to emergency services is coordinated with regional health services including the Centro Hospitalar do Alto Ave and highway patrol units from the GNR and municipal policing bodies. Payment integration aligns with national toll products and electronic transponders accepted across the Portuguese network.

Future developments and upgrades

Planned interventions consider capacity upgrades, junction reconfigurations, and safety enhancements driven by regional transport strategies adopted by the Norte Regional Coordination and Development Commission and national infrastructure plans. Proposals have included interchange improvements to better serve the Port of Leixões logistical expansion, noise mitigation measures near residential areas such as Póvoa de Varzim, and multimodal integration projects linking motorway access to rail nodes including Porto Campanhã and feeder lines to Braga. Funding and implementation may involve partnerships among the European Investment Bank, national ministries, and private concessionaires, with project scopes evaluated against environmental assessments administered by agencies like the Portuguese Environment Agency.

Category:Roads in Portugal