I really don't understand why must know whether camera working or not......just follow the speed limit la - you speed coz your pax ask you coz they in a hurry.....IMO you only jeopardize yourself. - I got one kaki driving with yellow, he tell me drop pax faster then can pick next pax........ Now he kena tp demerit pts until OBK.......
I am sorry that I was not reading this forum recently and so I missed answering you.
Our forum owner TAXIUNCLE is a regular driver and you can private message to him or to "smoothrider" to learn more about Palringo group and if interested, to try it out.
The group is based on an APP called Palringo (where you can download and install into your cellphone). It works just a walkie talkie but it is free of charge and has more functions than a walkie.