An electric scooter was spotted early Tuesday morning on the Metropolitan Expressway in Tokyo’s Shibuya Ward, prompting highway officials to release video footage on social media to warn riders of the extreme danger.

The Metropolitan Expressway operator said the incident occurred at around 3 a.m. on the inbound lane of the Shibuya Route. Video the company released shows an individual unlawfully riding an electric scooter onto the highway for about 1 kilometer, sometimes veering from the shoulder into traffic lanes. Fortunately, drivers were able to spot the scooter in time and avoided a serious accident, the company said.

While electric scooters are permitted on regular roads, their use on expressways is strictly prohibited due to the heightened risk of fatal accidents.