The city of Prague has two environmental zones where trucks and vehicles with a total weight of more than 3.5 tons (zone 1) and more than 6 tons (zone 2) are not allowed to drive. The first zone covers the whole area of the administrative district of Prague 1. The district is situated in the historical city centre, on both side of the Vltava. The second zone covers almost the entire area of Prague 1 and Prague 2 – it extends between the streets Vodičkova – Lazarská – Myslíkova – Masarykovo nábřeží – Resslova and Karlovo náměstí.