The public transportation system is dominated by the low-floor Volvo and Mercedes-Benz buses as well as Solaris trolleybuses. There are also plenty of the traditional Škoda vehicles, built in the Czech Republic, still in service, and many of these have been extensively refurbished internally. This is a result of major improvements that started in 2003 when the first brand-new Mercedes-Benz buses were bought. In 2004, a contract was signed with Volvo Buses to buy 90 brand-new 7700 buses over the following three years.