The 666 Sopota–Zagorje road is situated in central Slovenia, connecting the settlements of Sopota and Zagorje ob Savi. The route passes through the small settlement of Šklendrovec and is easily accessible from the town of Zagorje ob Savi, which lies approximately 2.4 km (1.5 miles) from the starting point and 8.85 km (5.5 miles) from the endpoint. The road traverses a region characterized by rolling hills and forested landscapes, providing a technical riding experience rather than a purely touristic one. An interactive map showing the precise route of the 666 Sopota–Zagorje road can be found at the end of this article.

The 666 Sopota–Zagorje road extends for approximately 10.3 km (6.4 miles), with an elevation range from 226 m (741 ft) to 736 m (2,415 ft). The road is predominantly asphalted and is rated as having a very good surface quality. Riders will encounter a route that is notably twisty, offering a series of engaging curves that demand attention and skill. The road width varies, with the majority (about 64%) being wide enough for comfortable passing, while the remainder alternates between middle and narrow sections. Most of the route consists of a single lane (about 84%), which requires careful navigation, especially in the more confined segments. Only a small proportion (about 19.4%) of the road passes through inhabited areas, allowing for an uninterrupted riding experience through rural and wooded terrain.

While the 666 Sopota–Zagorje road is primarily valued for its technical riding appeal, the surrounding area offers several attractions worth noting. The town of Zagorje ob Savi serves as a convenient base for exploring the region and provides access to local amenities. The nearby settlement of Šklendrovec offers a glimpse into rural Slovenian life. For those interested in extending their visit, the Ljubljana Castle is within reasonable riding distance and represents one of the most prominent historical sites in central Slovenia. Additionally, the Central Sava Valley is known for its natural beauty and outdoor activities, making it a suitable destination for riders seeking to combine motorcycling with sightseeing.

There are currently no permanent closures for motorcycles on the 666 Sopota–Zagorje road. The route remains open throughout the year, although temporary closures may occur due to maintenance work or adverse weather conditions, particularly during the winter months when snow and ice can affect road safety. Riders are advised to check local traffic updates before planning their journey, especially in the colder seasons. No regular event-related closures have been reported for this road.

The 666 Sopota–Zagorje road does not currently require the payment of a toll or entrance fee for motorcycles. However, toll conditions may change in the future, and it is recommended to verify the latest information before traveling. For up-to-date details on road tolls and entrance fees in Slovenia, consult the official DARS website. Riders should also ensure their motorcycles are in good condition to handle the road's twisty sections and variable widths, and always adhere to local traffic regulations.