Issues are determined by the majority driver-owners. An ordinance opposes taxi advertising. Such advertising could produce revenue to help offset the cost of new taxi service and security systems. Drivers and passengers do not fully accept shields in taxis. Drivers want to detach shields from cars they may use privately during off-duty hours.
Some passengers perceive shields to be an uncomfortable inconvenience.
Taxis traditionally rely on a cash-based fare system. Credit or debit cards would require more accurate accounting, and they may reduce the profit margin. Such technology would provide a foundation upon which to build a comprehensive passenger service and driver security system. There are undoubtedly other objectives and other constraints regarding driver security measures. Fully identifying the objectives and overcoming the constraints with regard to all the client groups will facilitate the selection and implementation of a successful security system.