Google Maps json output for all routes

my question is about google maps json output. i've here a start address and end address :

Google Maps Link

And at the following link, i display the result as json format :

Google Maps Json Format

It displays only one legs(route), but from start address to end address i've 4 routes. My question is, how can i display all routes in my json output?

Can you help me? Thanks in advance.