Can ETC be installed without mounting it on the windshield?
4 Answers
ETC does not have to be installed on the windshield; it can also be mounted on the dashboard below the windshield as long as it does not obstruct the driver's view, interfere with ETC signal reception, can charge via sunlight, and the small button on the back does not pop up. However, to ensure optimal performance, it is recommended that car owners install it on the front windshield. The ETC system uses automatic vehicle identification technology to establish wireless data communication between the vehicle and the toll station, enabling automatic vehicle recognition and the exchange of relevant toll data. Therefore, during installation, the sensing area must not be blocked to avoid signal reception failure.
Having driven for so many years, I've always firmly believed that the ETC device must be installed on the inside of the windshield. That position is specifically designed for it because the device has a solar panel that requires sunlight to function properly. If placed elsewhere, such as on the dashboard, the charging efficiency may be poor, leading to insufficient battery power. The antenna signal also needs to be aligned directly with the toll station direction, and the high position on the windshield has minimal interference, ensuring sensitive fee deduction. Some have tried placing it in the corner of the window or using adhesive hooks, but the weak signal often leads to failures, delaying passage or even being stopped for inspection. More importantly, the installation instructions and regulations recommend this position; otherwise, activation may fail or the warranty could become void, causing more trouble. So, for peace of mind and safety, sticking it directly to the windshield is the most reliable option—don’t try to outsmart the system.
From the perspective of signals and functionality, installing ETC away from the windshield poses multiple issues. I've studied the internal structure of automotive devices: the antenna operates on RF principles, requiring an unobstructed transmission path. The windshield's elevated position and wide field of view ensure accurate toll station recognition. If placed on the dashboard or blocked by seats, signal reflection and attenuation significantly increase failure risks. The solar panel also requires adequate light for charging - the windshield provides optimal illumination, while alternative locations may lead to power shortages and device shutdowns. A friend of mine installed it on the door handle for convenience, resulting in multiple failed deductions and costly reinstallation. I strongly recommend following the design specifications by mounting it in the designated position to ensure stable system operation without future complications.
My experience tells me that ETC must be installed on the windshield to be secure. Placing it elsewhere, such as the roof or trunk, can easily loosen it, and adjusting it while driving is dangerous. Poor signal reception may also lead to frequent errors at toll stations, or even suspicion of toll evasion. The official installation procedure specifies that location to ensure the device operates safely and seamlessly without any hidden risks. Don't just stick it anywhere for convenience to avoid unnecessary trouble.
