What does it mean when the ETC green light is flashing?

2 Answers
StReed
07/29/25 1:25am
ETC green light flashing indicates that the sensor is currently detecting. Here is an extended introduction: 1. Introduction to ETC: ETC is the Electronic Toll Collection system, which is an automatic toll collection system for highways or bridges. It uses dedicated short-range communication between the on-board electronic tag installed on the vehicle's windshield and the microwave antenna on the ETC lane at the toll station. 2. ETC working principle: It utilizes computer networking technology to perform background settlement processing with banks, achieving the purpose of vehicles passing through highway or bridge toll stations without stopping to pay tolls.
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McPiper
08/12/25 5:32am
The other day when I was driving on the highway, the ETC green light kept flashing, and I thought it was broken. I asked some car-savvy friends, and they said this is the device working normally, usually detecting signals when preparing to pass through the toll station. If it flashes normally, it means it's recognizing your card and waiting for the barrier to lift; but if it keeps flashing without passing, there might be an issue. Common reasons include the card not being inserted properly, signal interference, or low battery. I suggest first pulling over to restart the device and reinsert the card; if that doesn’t work, contact ETC customer service. Actually, ETC is quite convenient—it reduces queuing time. Just make sure to keep the card clean and check the installation position monthly to avoid malfunctions affecting your trip.
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