TD have the usual thinking that joining a longer Q can get pax
faster becos others think so,so he also join in follow the
crowd,but is it wise?
If the Q is not moving fast u will get stuck for an hr w/o
income as yr next customer may be the 20th or the 25th person.
If join shorter Q,the next 4 or 5 pax is yr customers.
Are you referring to Airport Qs ??
(Which Taxis Q in town can get stucked for 1hr ?).
Be Specific if you need advices. 
Short Q doesn't means got flights coming down (within) the next
1hr......
Queuing at Airport Terminals got timing... T1, T2, T3 &
Budget.
It is good to understand & do research on the timing... If
you are near AP, you can turbo there... If the timing is not
right.... then Zoom back to town or go the shopping malls
nearby.
Good Luck...
