cisco router interface : How can i see if the aTm line is max out

Hi , i have an iternet router that has an ATM circuit to L3.  The cisco guru told me that in order to see ( on way to see ) if the traffic is maxed out is to do sh int,
so if i do sh int i get something like
router#show interfaces serial 0/0
  ...
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)  
  ...
router#show interfaces serial 0/0
...
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue :0/40 (size/max)


so it it is 0/75/0/0 i am ok
but if i see
75/75/0/0 i guess things are pretty much max out  right ?