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Must ETC be installed on the windshield?

2 Answers
HenryLee
07/25/25 8:34am
ETC can be used without being attached to the glass. Installing ETC on the upper part of the windshield is to minimize obstruction of the driver's view and to ensure better recognition by the equipment at highway toll stations. If you prefer not to install it on the glass, place it in an open area where it can be seen through the windshield. For small cars, the ETC is generally installed in the upper middle part of the front windshield, while for large vehicles like trucks and buses, it is installed in the lower middle part. The suitable installation position should be no lower than 1.2 meters and no higher than 2.5 meters, with an installation angle between 30 and 90 degrees. For vehicles with factory-installed or aftermarket explosion-proof film, which may affect microwave communication signals, the ETC should be installed in the microwave window area. Here are some precautions for installing ETC: Do not obstruct the view; it is best to install it behind the rearview mirror: Many car models have windshields with a large rearward tilt angle, which can reduce the driver's field of vision. If ETC installation does not consider this, it may increase the driver's blind spots. Installing it behind the rearview mirror on the right side can help avoid obstructing the view. Do not interfere with charging: The ETC electronic tag consumes power but generally does not require charging or battery replacement, as it has a built-in solar panel for self-charging. Therefore, during installation, avoid the blackened areas of the windshield and positions that may block the solar panel. Once installed, do not remove it arbitrarily: The button in the middle of the adhesive is an anti-tamper lever connected to a switch. After installation, the windshield will press the anti-tamper lever in. If the tag is removed arbitrarily, the lever will pop out and trigger the switch, locking the electronic tag and rendering it unusable. You will then need to visit an ETC service point to unlock it. This mechanism is designed to prevent multiple vehicles from sharing one device. Things to note when using ETC: The ETC transaction sensing range is 8 meters. To prevent issues with the ETC device of the vehicle in front, maintain a distance of more than 10 meters to avoid automatic payment for the vehicle ahead. The ETC lane recognition speed is 20 kilometers per hour; driving too fast may result in failure to read the vehicle's device information, leading to payment failure. If using a debit card linked to ETC, insufficient balance will also cause payment failure.
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DiDerek
08/10/25 6:59pm
I've also researched the optimal ETC installation location, and based on practical driving experience, the windshield is indeed the best choice. There's a dedicated area in the upper middle section of the windshield that's free of metal coating, which doesn't interfere with ETC signal transmission at all. Last year when I helped a friend move their ETC from the dashboard to the windshield, the recognition speed at toll stations improved noticeably. Plus, the 3M adhesive provides extremely secure fixation – mine has stayed firmly in place for three years without falling off. Although some people stick it on the dashboard for convenience, the device may shift during sudden braking, obstructing the view, and prolonged exposure to summer sun might melt the adhesive, leading to repeated installations and more hassle. Therefore, considering both safety and stability, the windshield is absolutely the top choice.
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