Mumbai Traffic Police — Unprofessional Speed Camera: over limit challan

Hi,

Speed limit Camera is active in Delhi and specially in night but display board is proper and not visible in night, if new person enter in delhi then how he/she came to know the road speed limit.
There is no proper display of speed board on the road and what is the authenticity of measuring the speed. only challan procedure and night vision Camera is active to earn the money but there no proper visibility of instruction of speed.
This is not fairly good, it should be professional, if traffic police earning money from public then provide the better facility.

How a person entering on new road in Delhi then how he/she can know the speed on that road.