There are plenty to chose from, in fact there are literally hundreds of traffic exchanges out there. Use only the best ones to get the highest signup rates to your opt-in list. The following Traffic Exchanges have proved to bring the best results:
EasyHits4u
StartXchange
Traffic Splash
Traffic Era
Tezak Traffic Power
Dragon Surf
I Love Hits
Hitsilo
Hit2Hit
Traffic Taxis
Traffic Witch
S.W.A.T. Traffic
FastEasyTraffic
TrafficSwarm
SWEEVA
Free4u Exchange