Since LTA now require private car drivers to take up taxi driver vocational license, it should also reform existing taxi industry to optimize the customer experience for all commuters.
Those who those take taxi at peak hour will know, many taxi drivers like to put change shift, tell you they only go certain area etc. So LTA should set a rule, if a driver is not willing to drive a customer to a destination, he should always put busy sign and directly proceed to change shift. He should not stop and then reject the commuter. Commuters who see a taxi driver reject them, can take a photo of the cab and its license plate and send to LTA.