Display at the top and  Meter How the display at the top of the taxi and  meter works ?         Taxis provide services in the city from a taxi stand or from the place that the call can be made by the customer, they are identified by their color and display at the top  green-FREE  or red (with the number of tariff )-BUSY. These taxis have two colors, beige ovrblack with a green roof, these are the color of traditional Portuguese taxi, the taxi owners can choose between these two colors. When they buy their taxis. They can take up to 8 setter cars, but usually they are 4 setter cars. The taxis use the meter to calculate the cost of travel, according to the distance, number of persons (up to 4 or even 8), time of day and day of week. Between 21 pm and 6 am and on weekends the fare is increased by 20%.   :. Fares in use   see here