Can ETC be installed without attaching it to the windshield?

[DelIsla]

ETC can be used without being stuck to the glass. Installing ETC on the upper part of the windshield is to minimize obstruction of the driver's view while ensuring better recognition by highway toll station equipment. If you don't want to install it on the glass, try to place it in an open position where it can be seen through the windshield. The installation position for small cars is generally in the upper-middle part of the front windshield, while for large vehicles like trucks and buses, it is 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 to 90 degrees. For vehicles with anti-explosion film or those that have been retrofitted with it, which may affect microwave communication signal transmission, ETC should be installed in the microwave skylight zone. Here are some precautions for installing ETC: Do not block the view; it's best to install it behind the rearview mirror: Many car models have windshields with a large rearward tilt angle, which reduces the driver's field of vision. If ETC is installed without considering this, it may increase the driver's blind spots. Installing it behind the right side of the rearview mirror 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 because it has a solar panel on the back for self-charging. Therefore, during installation, avoid the blackened areas on the windshield and positions that may block the solar panel. Once installed, do not remove it casually: The adhesive in the middle has an anti-tamper rod connected to a switch. After installation, the windshield will press the anti-tamper rod in. If removed casually, the rod 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 is designed to prevent multiple vehicles from sharing one device. When using ETC, note the following: The ETC transaction sensing range is 8 meters. To prevent the ETC device of the vehicle in front from malfunctioning, maintain a distance of more than 10 meters from the vehicle ahead to avoid automatic payment for the wrong vehicle. The recognition speed for ETC lanes is 20 kilometers per hour. Driving too fast may result in failure to read the vehicle's device information, leading to payment failure. When using a debit card linked to ETC, insufficient balance may also cause payment failure.

[KiaraDella]

A friend asked me the same question just yesterday. He tried sticking his ETC device on the dashboard, but it failed to activate at toll gates every time. Eventually, he had to reattach it to the windshield as intended. Actually, the official design with those metal contacts requires direct contact with the glass to activate – installing it elsewhere might put the device into sleep mode. Solar panel placement matters too; mounting it on the dashboard risks shading from phone holders. Some enthusiasts have modified the device by rewiring and mounting it behind the rearview mirror, but this may disable the anti-tamper button and require reactivation. Personally, I think the simplest solution is following the manual's recommendation to install it in the top right corner of the windshield – after all, a device used daily on highways shouldn't be tinkered with too much.

[DelCaleb]

I've been driving for over a decade and have used three generations of ETC devices. I genuinely don't recommend installing it anywhere other than the windshield. The solar panel on the back of that little box requires at least 2 hours of sunlight daily. If placed on the dashboard, the instrument cluster shading will prevent it from charging. Last time I saw someone stick it on the sun visor, but when they flipped the visor down, the whole device shifted and triggered the anti-tamper protection. Actually, there's quite a bit to consider about windshield installation - you need to avoid the black ceramic dots while keeping it at least 5cm away from the metal roof edge. Remember to ask an auto shop for help; they have levels to ensure proper alignment. If you stick it on haphazardly yourself and get unstable signals at toll gates, it'll be really awkward.

[EvelynLee]

I specifically asked the staff at the highway toll station about this. The ETC device is installed on the windshield as per the manufacturer's standard design. The double-sided tape on the back of the device is a specially made conductive adhesive, and removing it will basically render the device unusable. However, if you really don't want to stick it on the glass, there are alternative solutions: you can purchase a magnetic suction bracket online and attach it to the dashboard, but you must ensure the device isn't blocked by the steering wheel. A friend tried placing it on the glove compartment, but after three months of sun exposure, the adhesive melted and the device fell and broke. It's recommended to first activate the device using a mobile hotspot before installation, then test the recognition rate by driving a few dozen kilometers with it in the intended position.

[LeilaniRose]

I've changed the position of my ETC device twice, and the most practical spot is the corner of the windshield on the passenger side. I once tried mounting it on the dashboard holder, but the 70°C summer heat inside the car caused it to detach due to the adhesive melting. The mechanic mentioned that high temperatures could also cause the built-in battery to swell, which would be counterproductive. Actually, the new devices are much more compact now; the coin-sized new models are almost invisible when stuck behind the rearview mirror. I've observed taxi fleets, and they all use swivel mounts on the rearview mirror base, which can be removed when parking to prevent sun damage. If you really dislike sticking it to the glass, you might as well get a credit card ETC without a device and keep it in your wallet for use.

[AthenaLee]

My neighbor just had their car hood hit by the toll gate because of incorrect ETC placement, which scared me into immediately checking my own device. There are three main reasons why the manufacturer requires it to be mounted on the windshield: first, the windshield offers the best microwave signal penetration; second, the solar panel faces outward for higher charging efficiency; and third, the gravity sensor requires vertical calibration for accurate readings. One car enthusiast used 3M adhesive to mount it on the triangular window but ended up frequently triggering the anti-theft lock by mistake. For new installations, it's recommended to avoid the heating wire area, clean the inside of the glass with alcohol before applying, and ensure proper adhesion. If you really need to relocate it, you can purchase a detachable ETC unit with a base, though the whole set costs over 200 yuan.