C-16 or Eix del Llobregat is a primary highway

Highway

A highway is any public road. In American English, the term is common and almost always designates major roads. In British English, the term designates any road open to the public. Any interconnected set of highways can be variously referred to as a "highway system", a "highway network", or a...

 in Catalonia

Catalonia

Catalonia is an autonomous community in northeastern Spain, with the official status of a "nationality" of Spain. Catalonia comprises four provinces: Barcelona, Girona, Lleida, and Tarragona. Its capital and largest city is Barcelona. Catalonia covers an area of 32,114 km² and has an...

, Spain. It is also part of the European route E09, from Orléans

Orléans

-Prehistory and Roman:Cenabum was a Gallic stronghold, one of the principal towns of the Carnutes tribe where the Druids held their annual assembly. It was conquered and destroyed by Julius Caesar in 52 BC, then rebuilt under the Roman Empire...

 (France) to Barcelona

Barcelona

Barcelona is the second largest city in Spain after Madrid, and the capital of Catalonia, with a population of 1,621,537 within its administrative limits on a land area of...

 (Catalonia, Spain).

According to the 2004's new codification for primary highways managed by the Generalitat de Catalunya

Generalitat de Catalunya

The Generalitat of Catalonia is the institution under which the autonomous community of Catalonia is politically organised. It consists of the Parliament, the President of the Generalitat of Catalonia and the Government of Catalonia....

, the first number (C-16) indicates that is a south-northbound highway, whereas the second number (C-16) indicates that is the sixth westernmost.

The itinerary starts at Barcelona

Barcelona

Barcelona is the second largest city in Spain after Madrid, and the capital of Catalonia, with a population of 1,621,537 within its administrative limits on a land area of...

's Via Augusta and heads northbound crossing the Serra de Collserola

Serra de Collserola

The Serra de Collserola , or simply Collserola, is a mountain range between the rivers Besòs and Llobregat. It is part of the Catalan Coastal Range....

s mountain range, through the Vallvidrera

Vallvidrera

Vallvidrera is a neighborhood of Vallvidrera, Tibidabo i les Planes of the Sarrià-Sant Gervasi district of Barcelona, Catalonia, in one of the sides of the Collserola hills . There are excellent views over the city and the Mediterranean from Vallvidrera, on a clear day it's possible to see the...

's tunnel, and then the comarques

Comarca

A comarca is a traditional region or local administrative division found in parts of Spain, Portugal, Panama, Nicaragua, and Brazil. The term is derived from the term marca, meaning a "march, mark", plus the prefix co- meaning "together, jointly".The comarca is known in Aragonese as redolada and...

 of Vallès Occidental

Vallès Occidental

Vallès Occidental is a comarca in Catalonia, Spain. It is unique among the comarques in that the two cities Sabadell and Terrassa share the role of comarcal capital...

, Bages

Bages

Bages is a comarca in the center of Catalonia, Spain. It includes two subcomarques, el Moianès and el Lluçanès.Industries include the mining of potash at Súria and Sallent, and the manufacture of textiles along the rivers Llobregat and Cardener...

 and Berguedà

Berguedà

Berguedà is a comarca in the interior of Catalonia, Spain, lying partly in the Pyrenees and partly in Catalonia's Depressió Central.-Geography:...

. Most of the path follows the valley of the Llobregat

Llobregat

The Llobregat is the second longest river in Catalonia, Spain. It originates in Castellar de n'Hug at an altitude of 1,259 meters in the Serra del Cadí, and ends in the Mediterranean Sea, in the municipality of El Prat de Llobregat, near Barcelona...

 river, hence the name of Eix del Llobregat. Finally it crosses another mountain range, Serra del Cadí

Serra del Cadí

The Serra del Cadí is a mountain range running north of Catalonia, Spain, part of the Pre-Pyrenees. Its highest peak is the Vulturó, with an altitude of 2,648 metres....

, through the Cadí's tunnel, and enters in the comarca of Cerdanya

Cerdanya

Cerdanya is a natural comarca and historical region of the eastern Pyrenees divided between France and Spain. Historically it has been one of the counties of Catalonia....

. The path finishes at the connection with road N-260

N-260

The N-260, also known as Eje Pirenaico , is the northernmost east-west national road in Spain.In contrast to the majority of Spanish national roads, which were specially constructed during the mid-20th century, the path for this highway was established at 80's decade over several previously...

 at Puigcerdà

Puigcerdà

Puigcerdà is the capital of the Catalan comarca of Cerdanya, in the province of Girona, Catalonia, northern Spain, near the river Segre and the border with France .- History :...

, very close to the french border

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

.

This highway, along with C-17

C-17 (highway)

C-17 or Eix del Congost is a primary highway in Catalonia, Spain. According to the 2004's new coding for primary highways managed by the Generalitat de Catalunya, the first number indicates that is a south-northbound highway, whereas the second number indicates that is the seventh westernmost...

, is a main South-North communication in Catalonia

Catalonia

Catalonia is an autonomous community in northeastern Spain, with the official status of a "nationality" of Spain. Catalonia comprises four provinces: Barcelona, Girona, Lleida, and Tarragona. Its capital and largest city is Barcelona. Catalonia covers an area of 32,114 km² and has an...

, since it connects Barcelona with several significant inner cities and towns such as Terrassa

Terrassa

Terrassa is a city in the east central region of Catalonia, Spain, in the comarca of Vallès Occidental, of which it is the co-capital along with Sabadell, the historic capital....

, Manresa

Manresa

Manresa is the capital of the Comarca of Bages, located in the geographic centre of Catalonia, Spain, and crossed by the river Cardener. It is an industrial area with textile, metallurgical, and glass industries. The houses of Manresa are arranged around the basilica of Santa María de la Seo....

, Berga

Berga

Berga is the capital of the comarca of Berguedà, in Catalonia, Spain.- History :Berga derives its name from the Bergistani, an Iberian tribe that lived in the area before the Roman conquest. The Bergistani were first subdued by Hannibal in 218 BC...

 or Puigcerdà

Puigcerdà

Puigcerdà is the capital of the Catalan comarca of Cerdanya, in the province of Girona, Catalonia, northern Spain, near the river Segre and the border with France .- History :...

. It is also the straightest and quickest way from Cerdanya

Cerdanya

Cerdanya is a natural comarca and historical region of the eastern Pyrenees divided between France and Spain. Historically it has been one of the counties of Catalonia....

 comarca and from Andorra

Andorra

Andorra , officially the Principality of Andorra , also called the Principality of the Valleys of Andorra, , is a small landlocked country in southwestern Europe, located in the eastern Pyrenees mountains and bordered by Spain and France. It is the sixth smallest nation in Europe having an area of...

to the centre, the South and the East of Catalonia, including its major city and capital, Barcelona.