interrupt priority

I have arduino mega. /this board supports interrupts on 2,3 21,20,19,18 pins.

I want to connect 4 interrupts which occur in my project (traffic lights based on ambulance detection). while one interrupt is being served, the other interrupts may go high. after completion of first interrupt, there may be more than one interrupt high. hence i want to know the default priority of interrupts. it is not possible to change hardware connections hence ,is there any possiblity to change the priority??

if so please give me the code for changing the priority??

Interrupt priority is fixed and is defined by HW so I'm afraid that it is impossible to change its priority. See ATmega2560 datasheet for details there is table with interrupt priority.

No matter how many time you ask this question, such as in interrupt priority the facts will remain the same.

I'm locking this thread because this is your 3rd cross-post about it. If you start another thread about interrupt priority you will be banned for violating forum rules.