Under CNRT passenger transport regulations, are standing passengers (pasajeros de pie) permitted on long-distance interurban and interstate bus services (servicios de larga distancia)?

1. Yes, up to 30 standing passengers are permitted on highways
2. No, transporting standing passengers is strictly prohibited on interurban long-distance and highway routes; all passengers must occupy a dedicated seat equipped with a safety belt
3. Standing passengers are permitted only during holiday peak travel
4. Standing is allowed if passengers hold onto overhead leather straps