A new road sign featuring a white diamond on a blue background is being implemented across Europe to designate carpool lanes. These lanes are exclusively for vehicles carrying at least two passengers. France introduced the sign, resembling a rhombus, last year and it has become a standard feature on its roads. Drivers who use these lanes without meeting the passenger requirement face a fine of 135 euros. The sign aims to encourage carpooling and reduce traffic congestion. Authorities emphasize the importance of recognizing and adhering to the new regulation to avoid penalties. The initiative is part of a broader effort to promote sustainable transportation options.