It is estimated that only ten per cent of Croatian buses fulfill the conditions needed to be met in order to be allowed to drive on Western European roads. The rest must remain on domestic routes, which, due to the linking of northern and southern Croatia by railway, have decreased in number by a third over the last two years. The situation with trucks is similar. The perspective for Croatian agricultural vehicles is even worse, as the environmental regulations in EU countries have recently become much stricter.
Every country determines a specific quota which is valid for other countries.
Thus a situation can occur whereby a bus with Croatian registration is allowed to cross the border into Austria, while a similar bus with Bosnian-Hercegovinian registration is refused entry. Switzerland and Austria have the strictest regulations in force. Slovenia has somewhat milder regulations, but the situation can blow hot or cold, depending on the state of relations with Croatia at any given time. The situation with Germany is interesting as they have not, up to now, posed any problems for Croatian transport vehicles. There are two reasons for this.