Discuss what are the bases or technicalities for not granting patent.

The requirements for patenting vary slightly between different countries, but some of the common requirements are that the claims claim something that:

is useful / has an industrial application

is new / novel

is non-obvious / makes an inventive step

is supported by a corresponding specification

is definite / clearly written

Note that patents are granted based on the claims meeting those requirements.

Most major countries that grant patents have an office with examiners to examine applications. It is their duty to grant patents unless the examiner explains otherwise based on the technicalities of those requirements.

Explanation:

we stop at red lights because, quite often, those who are crossing the intersection, with the right of way may very well t-bone your car and kill you, your passengers and even the people in the other car.

explanation:

who knows? not you apparently