Indeed, that was in Morocco and a lot of the scooters were slower than me, being weighed down with entire families plus a month's fuel and shopping. They also tended to slow to around 10 km/h when on the phone.
The sign is eminently sensible - the cars and lorries stay out of the cycle lane, and the cyclists, donkeys, scooters, horse carts, etc have their own stretch of tarmac.