When driving in Slovenia, you should always have your headlights on. In case you forget: other drivers may notify you by blinking with their headlights. The same blinking signal is also used to warn for obstacles on the way, inform you about a speed control further on or that someone in a faster car would like to pass you.
For the use of a motorway (avtocesta), it is obligatory to buy a vignette. You can obtain these at petrol-stations and at the Slovenian border. Especially in summer, this is regularly checked.
At motorways, the speed limit is 130 km/h, but some drive (much) faster. At times, this unequal speed of different drivers can cause irritation on both sides and therefore lead to dangerous situations.
Motorways and larger roads are well maintained. Some smaller roads can have cracked asphalt: due to the sometimes severe winters, asphalt does not last particularly long. Note that the GPS may send you over unpaved forest roads: these are part of the official road network.
At smaller forest roads you may encounter a sign “Gozdna cesta – uporaba na lastno odgovornost”. This translates as “Forest road – use at your own responsibility”. It is allowed to drive here, however, your car insurance policy may not apply on these roads. Note also that at some forest road stretches, you may not have a telephone signal. These unpaved forest roads may seem remote, but you can encounter trucks which are loaded with wood. Truckdrivers mostly do not expect people on the roads: they drive fast and a heavy-loaded truck cannot stop instantly. Underneath the “Forest-road” sign there may be an additional sign that cautions you for forest fires.