Egypt's metro authority launched on Sunday a new WhatsApp service for passengers to send their complaints and suggestions, spokesperson Ahmed Abdel-Hady told Ahram Online.

Abdel-Hady said he had already started receiving many "useful suggestions."

"I have been receiving hundreds of messages since early this morning, some have been asking for camera surveillance inside metro carriages, some complaining about street vendors in the metro, while others have been asking for the re-opening of the Tahrir metro station," he said.

Central Cairo's Sadat station, which lies under Tahrir Square, has been closed since August 2013 following the dispersal of a sit-in supporting ousted Islamist president Mohamed Morsi.

The metro official said all constructive suggestions would be taken into consideration.

"I have already spoken to all officials at the metro authority and addressed all the suggestions that have been sent until this moment so that each official can start implementing the recommendations that would benefit citizens," highlighted Abdel-Hady.

Approximately three million people use the metro on a daily basis, according to the State Information Service (SIS).

Metro transportation is one of the fastest and cheapest means of transportation in Cairo. A metro ticket costs LE1 which is equivalent to 13 cents.