Must the ETC device be affixed to the windshield?

[MalachiFitz]

The ETC device can be used without being attached to the windshield. Installing the ETC on the upper part of the windshield is intended to minimize obstruction of the driver's view while ensuring better recognition by highway toll station equipment. If you prefer not to install it on the windshield, place it in an open area where it can still be seen through the windshield. For passenger cars, the ETC is typically installed in the upper middle section of the front windshield, while for large vehicles like trucks and buses, it is installed in the lower middle section. The recommended installation height is between 1.2 meters and 2.5 meters, with an installation angle ranging from 30 to 90 degrees. If the vehicle has a built-in or aftermarket explosion-proof film, which may interfere with microwave signal transmission, the ETC should be installed in the microwave window area. Here are some important considerations for ETC installation: 1. Avoid obstructing the driver's view—installing it behind the rearview mirror is ideal: Many car models have windshields with a steep rearward angle, which can reduce the driver's field of vision. Installing the ETC without considering this may increase blind spots. Placing it behind the rearview mirror on the right side helps avoid blocking the driver's view. 2. Ensure it does 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, avoid installing it on the windshield's blackened areas or any location that might block the solar panel. 3. Do not remove it once installed: The adhesive backing includes an anti-tamper rod connected to a switch. Once installed, the windshield presses the rod inward. If the device is removed, the rod pops out, triggering the switch and locking the electronic tag, rendering it unusable until unlocked at an ETC service center. This mechanism prevents multiple vehicles from sharing a single device. Additional usage tips for ETC: - The ETC transaction sensing range is 8 meters. To avoid unintended payments due to malfunctions in the vehicle ahead, maintain a distance of at least 10 meters from the preceding car. - The ETC lane recognition speed is 20 km/h. Driving too fast may prevent the system from reading the device, leading to failed transactions. - If using a debit card linked to the ETC, insufficient balance may also cause transaction failures.

[VonLena]

I've driven many cars before, and when installing an ETC device, it usually needs to be stuck on the windshield, mainly to ensure smooth signal transmission and driving safety. The windshield position prevents other objects from blocking the signal, allowing the system to read it quickly at toll stations and reducing delays. If placed on the dashboard or center console, the signal might weaken. I once tried placing it on the passenger side, but the toll station couldn't detect it, and I had to reverse and try again—super annoying. Additionally, traffic regulations require such devices not to obstruct the driver's view, making the top area of the windshield ideal—it doesn’t interfere with visibility and stays securely in place. When installing, use the provided adhesive tape and clean the glass surface thoroughly; if the car has special tinting, the position might need adjustment. In short, for reliability and convenience, I always stick it on the windshield—it’s hassle-free and efficient.

[LouisAnn]

I personally focus on the technical aspects, and installing the ETC device on the windshield is the optimal choice. The principle is that it needs to connect to the toll antenna via radio signals, and the windshield is relatively transparent, maximizing signal reception and transmission efficiency. I've researched that the vehicle's metal structure or window tinting in other locations can cause interference, leading to read failures; placing it on the dashboard may result in shaking or overheating, affecting the device's lifespan. If forcibly installed elsewhere, the signal strength becomes unstable, especially at highway toll stations, where sudden braking might cause errors. In practical use, the windshield position is safe and compliant, avoiding interference with driving visibility. I recommend cleaning the glass first, then finding a non-obstructive spot to stick it properly; maintenance is simple—just avoid exposing it to high temperatures for long-term use.

[VanTravis]

I believe sticking the ETC on the windshield is crucial because driving safety comes first. Regulations require that the device must not obstruct the driver's line of sight when installed, and the top of the windshield is the safest and most reliable location. I've experienced that if you casually place it on the passenger side dashboard, the device may loosen and slide, interfering with driving. Poor signal reception can even cause slowdowns at toll stations, increasing the risk of rear-end collisions. Improper placement may also lead to inspection failures—I was once reminded during an annual inspection that it must be installed in the designated area. So for the sake of yourself and others, sticking it on the windshield is the wisest choice. I always check if it's secure before each drive, and it has worked smoothly ever since.