Lane splitting is legal in a few places worldwide, with varying rules and acceptance: United States:

• California is the only state where lane splitting is fully legal and explicitly permitted by law since 2016. Motorcyclists can ride between lanes of stopped or moving vehicles under certain safety guidelines

• Some other states like Utah, Montana, Arizona, Colorado, Minnesota, and Hawaii allow forms of lane filtering or limited lane splitting, mostly when traffic is stopped or slow-moving, but these are more restricted than California's laws and often have speed limits and conditions

• Most other U.S. states either explicitly prohibit lane splitting or have no specific laws addressing it, which can lead to legal gray areas or enforcement based on other traffic laws

Europe:

• Lane splitting (often called lane filtering) is legal and widely practiced in most European Union countries, including the Netherlands, France, and Italy, where it is often expected in traffic

• Some countries like Germany allow lane filtering only under strict conditions (e.g., very slow or stopped traffic) and have more restrictive rules

• Spain generally prohibits lane splitting, though it might be tolerated to some degree in certain areas

Australia:

• Lane splitting is legal under strict conditions in some states such as New South Wales (since 2014) and Queensland (since 2015), following public debate and clarification of laws

In summary, lane splitting is fully legal and regulated in California (USA), legal with conditions in several other U.S. states, legal and common in most of the European Union (with exceptions), and legal under conditions in parts of Australia. Many other places either prohibit it or have unclear laws on the practice