Optimizing squid

My name is Federico Petronio

I work as System administrator at Faculty of Agriculture at The
University of Buenos Aires.
I would like to ask you some question regarding squid use optimization.
First of all, I will describe the scenario:
We have a machine with squid installed. All the machines in our Faculty
use this squid to navigate.
We have two gateways to Internet, so we think squid could chose between
these two gateways in order to access the URLs required by the users.

Can squid dynamically (and in an intelligent way) chose between
different gateways ?

Can squid (or any other tool) detect which gateway is the fastest and
then use it ?

Thank you.

--
                                        Federico Petronio
                                        petronio@ifeva.edu.ar
                                        Linux User #129974