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In page Zagreb:

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Zagreb is the hub of five major Croatian highways. The A6 highway was upgraded in October 2008 and leads from Zagreb to Rijeka, forming a part of the Pan-European Corridor Vb. The upgrade coincided with the opening of the bridge over the Mura river on the A4 and the completion of the Hungarian M7, which marked the opening of the first freeway corridor between Rijeka and Budapest.[1] The A1 starts at the Lučko interchange and concurs with the A6 up to the Bosiljevo 2 interchange, connecting Zagreb and Split. A further extension of the A1 up to Dubrovnik is under construction. Both highways are tolled by the Croatian highway authorities Hrvatske autoceste and Autocesta Rijeka - Zagreb.[citation needed]