Buses are another means of transportation for getting around Buenos Aires.
The large network of city buses is called “Colectivos.” There are 144 
different lines in total, and each line is identified with a number and color.
The minimum fare on the bus is $0.80, and the total fare depends on the length of your trip. When you board the bus you tell the driver what your final destination is, and then he punches that information into the ticket machine, giving you the total amount that you owe. You insert your COINS (you must pay with change) into the machine, and a receipt will be printed out.
If you don’t have exact change, insert the coins you have, and wait for the machine to dispense your change. Keep your receipt until you get off the bus at your destination.
When you are ready to get off the bus walk towards the back of the bus and ring the bell that is above the back door. This signals the driver that there is a passenger waiting to get off, and the bus will stop for you.
The Colectivos has stops every two or 3 blocks, and most of the lines 
operate 24 hours a day, 7 days a week. During the late night and early morning buses run less frequently.
In addition to the Colectivos line there is another bus line called “Diferencial.” These lines are similar to the regular lines in that they run the same routes, with the same number and the same color, the only difference is that they are express buses. This means they stop less, and they are nearly double the price.
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The screeching, ear-piecing noice from Buenos Aires’ will jolt you out of bed at all hours. There is no limit to how much they can pollute or how many decibels they can emit. Ive never seen anything this bad. Entire streets are full of swirling clouds of fumes. One bus alone can white out a street. Today a bus went by puerto madero that youd have to travel to Africa to see anything that bad.
If you want to hear buses that are as loud as jet airplanes taking off, come to BA. If you want to choke on fumes all day, have your apt. coated in soot, and spend your day with eyes burning, come to BA.