Upgrading By Lean Daval Jr. - January 25, 2018 9:42 pm UPGRADING. Taxi units form a long queue as the drivers wait for passengers outside a shopping mall along J.P. Laurel Ave., Davao City on Wednesday. The Metro Davao Taxi Operators Association, Inc. (MEDTOA) has started to install cellular phone units to taxi units for use in the implementation of the Hirna taxi hailing app project which is scheduled to be launched next month. LEAN DAVAL JR