The Autovía A-40 is a gradual upgrade of the N-400 a highway in Castile

Castile (historical region)

A former kingdom, Castile gradually merged with its neighbours to become the Crown of Castile and later the Kingdom of Spain when united with the Crown of Aragon and the Kingdom of Navarre...

, Spain

Spain

Spain , officially the Kingdom of Spain languages]] under the European Charter for Regional or Minority Languages. In each of these, Spain's official name is as follows:;;;;;;), is a country and member state of the European Union located in southwestern Europe on the Iberian Peninsula...

. The road runs from Toledo

Toledo, Spain

Toledo's Alcázar became renowned in the 19th and 20th centuries as a military academy. At the outbreak of the Spanish Civil War in 1936 its garrison was famously besieged by Republican forces.-Economy:...

 to Cuenca

Cuenca, Spain

-History:When the Iberian peninsula was part of the Roman Empire there were several important settlements in the province, such as Segóbriga, Ercávica and Gran Valeria...

.

After junction 73 of Autovía A-42

Autovía A-42

The Autovía A-43 is a highway in Castile, Spain. It connects Madrid to Toledo. It is also known as the Carretera de Toledo.It has been superseded by the Autopista AP-41 between Madrid and Toledo. It continues south east of Toledo as an upgrade of the CM-400 passing along the Sierra de Nambroca...

 the road as N-400 heads east along the south bank of the Rio Tajo. At Aranjuez it crosses the Autovía A-4

Autovía A-4

The Autovía A-4 or Autopista AP-4 is a Spanish autovía and autopista route which starts in Madrid and ends in Cádiz....

 and Autovía R-4. It follows the A-4 before branching east after Ocaña. At Tarancón the road crosses the Autovía A-3

Autovía A-3

The Autovía A-3 is a Spanish autovía which starts in Madrid and ends in Valencia.- Sections :- Major cities crossed:*Madrid*Arganda del Rey*Tarancón*Honrubia*Motilla del Palancar*Minglanilla*Utiel*Requena...

 before heading east into the Sierra de Altomira and a bridge over the Canal de Trasvase Tajo Segura. The new AVE

AVE

Alta Velocidad Española is a service of high-speed rail in Spain operated by Renfe, the Spanish national railway company, at speeds of up to . The name is literally translated from Spanish as "Spanish High Speed", but also a play on the word , meaning "bird".AVE trains run on a network of...

 line from Madrid

Madrid

Madrid is the capital and largest city of Spain. The population of the city is roughly 3.3 million and the entire population of the Madrid metropolitan area is calculated to be 6.271 million. It is the third largest city in the European Union, after London and Berlin, and its metropolitan...

 to Alicante

Alicante

Alicante or Alacant is a city in Spain, the capital of the province of Alicante and of the comarca of Alacantí, in the south of the Valencian Community. It is also a historic Mediterranean port. The population of the city of Alicante proper was 334,418, estimated , ranking as the second-largest...

 and Valencia is to the south of the road. The road is Autovía

Autovía

An autovía is one of two classes of major highway in the Spanish road system similar to a motorway. It is akin to the autopista, the other major highway class, but has fewer features and is never a toll road. Some distinguishing features of an autovía are that it must be divided by a median, it...

 grade as it passes through the Altos de Cabrejas and over the Puerto de Cabrejas (1,150m) before reaching Cuenca and junctions with the N-320, N-420.