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Carrying both transponders will likely cause problems because each transponder simultaneously emits its identifying signal. Even if you are traveling in Oregon with your Green Light transponder mounted correctly and your PrePass transponder stored in the glove box, there is still a good chance the system will detect the PrePass transponder signal first and spoil the chance to preclear the weigh station.
For trucks with both transponders, we recommend:
PrePass TranspondersThe ID number that your PrePass transponder transmits is not recognized by the Oregon computer that runs the Green Light system. Oregon is not authorized to enter PrePass transponder numbers into the Green Light database. If you have questions about that policy, contact PrePass at 1-800-PrePass.
Terms and Conditions of Transponder Usage in Oregon
Registration and Tax
The program currently serves 3,924 companies with 31,104 trucks equipped with transponders. See how preclearance participation has grown:
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