Just how reliable are SPEED CAMERAS?

Below are FOUR MAIN CATEGORIES into which a mass having increasing Kinetic Energy may fall and from them a TRUE VELOCITY is DEPENDANT upon KNOWING which category to apply and not simply a matter of dividing DISTANCE by TIME!. IF speed cameras cannot distinguish between between them then their Velocity values can vary providing false readings.

 

The FOUR DISTINCTIONS between  "DISTANCE & TIME" in providing:-

1. FIRST ORDER POLYNOMIAL -CONSTANT VELOCITY [ FLAT LINE ] : ZERO ACCELERATION

2. SECOND ORDER POLYNOMIAL - INCREASING VELOCITY [ LINEAR ]: CONSTANT ACCELERATION [ FLAT LINE ]

3. THIRD ORDER POLYNOMIAL - INCREASING VELOCITY [ POLYNOMIAL ]: INCREASING ACCELERATION [ LINEAR ]

4. FOURTH & HIGHER POLYNOMIAL - INCREASING VELOCITY [ POLYNOMIAL ]: INCREASING ACCELERATION [ POLYNOMIAL ]

 

RELEVANCE:

How does one ascertain the TRUE VELOCITY or ACCELERATION of a MASS possessing KINETIC ENERGY if the ONLY attributes MEASURABLE are "DISTANCE and TIME" which can yield VARIANCE, dependant upon which of the above categories ( 1 to 4 ) it conforms too?.

 

IMPLICATIONS:

IF speed measuring devices CANNOT DIFFERENTIATE between the CATEGORIES listed above THEN the VELOCITY of a "MOVING TARGET under OBSERVATION" may be subject to ERROR in providing FALSE READINGS.