The traffic sign "One-lane vehicles allowed" (1022-15) indicates that the road ahead is restricted to vehicles that can only use one lane. This means that any larger vehicles, such as buses or trucks that require more space, are not permitted on this road.

This sign is typically found in areas where a narrow road or a situation with limited space exists, ensuring the safety and smooth flow of traffic. Drivers should be aware of this sign and ensure they are driving a vehicle that complies with the one-lane restriction when they enter this zone.

If you have any further questions about this sign or other traffic rules, feel free to ask!