In Greece (and much of Europe), a circular blue sign with a red border and a single diagonal red line means "No Waiting," but a blue circle with a red border and two diagonal red lines forming a cross (X) means "No Stopping and No Standing" (Clearway). This is one of the strictest parking/stopping signs in the Greek Highway Code. When you see this sign, you are prohibited from stopping your vehicle for any reason, including dropping off or picking up passengers, even for a few seconds. These signs are typically placed on narrow, high-traffic city streets in Athens or Thessaloniki, or on major highways where a stationary vehicle would create a significant hazard or bottleneck. Fines for violating this sign can be steep, and in busy urban areas, it is common for police to remove the license plates of illegally parked cars. If there are specific times or days when the restriction applies, they will be listed on a small white plaque beneath the sign. Always look for these "X" signs before pulling over, as Greek "Municipal Police" are very active in enforcing clearway zones.