The D1 motorway () is the main motorway of the Czech Republic. Currently it connects the two biggest Czech cities, Prague and Brno; in the future it will be extended to Ostrava and to the Czech–Polish border in Věřňovice (Karviná District) / Gorzyczki (Wodzisław County). It is long, but the planned length is . It is the busiest motorway in the Czech Republic, with a maximum AADT of 99,000 vehicles per day near Prague. History First attempt The Munich Agreement in 1938 deprived the country of some fundamental road and rail routes. The government rushed to prepare three major infrastructure projects: the Německý Brod – Brno railway; the Plzeň – Ostrava road; and a 4-lane highway from Prague to Velký Bočkov (on the Czechoslovak – Romanian border). On 23 December 1938 the government issued Decree no. 372/1938 Coll. concerning the construction of motorways, establishing the General Motorway Directorate. This decree called for construction of an east-west motorway within four years. As of January 1939, the General Motorway Directorate had 108 employees. On 13 January 1939, the Prague – Jihlava – Brno – Slovak border motorway project was approved, and construction was started on two segments: Chodov (now part of Prague) – Humpolec; and Zástřizly – Lužná. The prime minister of Carpathian Ruthenia, Avgustyn Voloshyn, requested that the Slovak border – Chust segment be added to the plan as well. Construction began on the Zástřizly – Lužná segment on 24 January in Zástřizly in the Chřiby mountains. The German occupation of Czechoslovakia brought only small technical changes to the project, and the construction of another segment, Chodov – Humpolec, began in May 1939. The increasing demands of World War II slowed down the construction, and the works were completely halted in 1942. After the war the works were resumed mainly on major bridges in 1946, but only with a small workforce. After 1948 the works continued. But in January 1949 the segment in Chřiby was abandoned, and the Prague – Humpolec segment met the same fate one year later. All 77 km of motorway under construction at that time, including 60 bridges, remained in disuse. Second attempt In the 1960s, traffic was growing very quickly, and a new plan for a D1 highway from Prague to the Soviet Union border was formulated. Work on the Prague – Brno section started in 1967, mainly using the old route from the first attempt.