Cairo Transportation Authority (CTA) is the operator of mass transit within Cairo, and the largest operator in Egypt

Egypt

Egypt , officially the Arab Republic of Egypt, Arabic: , is a country mainly in North Africa, with the Sinai Peninsula forming a land bridge in Southwest Asia. Egypt is thus a transcontinental country, and a major power in Africa, the Mediterranean Basin, the Middle East and the Muslim world...

.

CTA operates buses , a surface metro, ferries and river buses. Through its subsidiary Greater Cairo Bus Company (GCBC) it operates buses and minibuses, and is progressively converting its buses from diesel to low-emission CNG

Compressed natural gas

Compressed natural gas is a fossil fuel substitute for gasoline , diesel, or propane/LPG. Although its combustion does produce greenhouse gases, it is a more environmentally clean alternative to those fuels, and it is much safer than other fuels in the event of a spill...

 engines under the Cairo Air Improvement Project.

CTA operates more than 3000 buses, 950 minibuses and 40 Nile ferries

Ferry

A ferry is a form of transportation, usually a boat, but sometimes a ship, used to carry primarily passengers, and sometimes vehicles and cargo as well, across a body of water. Most ferries operate on regular, frequent, return services...

. With more than 37000 employees, it offers transport services to more than 3.5 million riders a day.