What are the regulations for car spoiler modifications?

[AnnaAnn]

Car spoiler modification regulations are as follows: 1. Do not obstruct the view: The installed spoiler must not block the rear view. 2. Do not cover the lights: It must not obstruct the taillights or brake lights. 3. Must not cause harm to others in an accident: There should be no sharp or protruding parts at the rear edge that could injure vehicles or pedestrians behind in case of an accident. 4. Must not alter the vehicle's silhouette: The modification should not change the original model's appearance when viewed from the rear. 5. Registration is required: Unauthorized modifications without registration are considered illegal. Driving a vehicle with illegal modifications on public roads will result in the vehicle being detained by traffic police, the illegal parts confiscated, and the owner ordered to restore the vehicle to its original condition, along with a fine of 200 yuan. Vehicles with illegal modifications will not pass the safety technical inspection and will not be issued a compliance certificate.

[VonKaden]

I previously installed a small spoiler on my car, but it's essential to understand the regulations first. National regulations require that the spoiler height must not exceed 30 centimeters, and the width should not extend beyond the vehicle body. Large racing-style spoilers are definitely illegal. The material should be carbon fiber or plastic, as metal with sharp edges is unsafe. After modification, remember to register the changes at the vehicle management office, and prepare your ID card, vehicle license, and registration certificate. Otherwise, you'll definitely face issues during the annual inspection. If you're caught with illegal modifications by traffic police on the road, not only will you be fined, but you'll also have to remove it on the spot. It's advisable to contact the local vehicle management office in advance to inquire about details, as enforcement varies between cities. Safety comes first—my friend installed a cheap one that almost flew off during highway driving. If you're going to buy one, choose a quality product you can trust.

[DiMiranda]

We've handled numerous cases of illegal modifications. When it comes to rear spoiler modifications, strict compliance with regulations is mandatory. Dimensions are non-negotiable: height must not exceed 30cm above the roof, and width must never extend beyond the vehicle's body contour. Materials must be non-metallic with rounded edges free of sharp angles. Most crucially, modified vehicles must undergo registration changes at the DMV within 10 days, or they'll fail annual inspections. Some owners assume small spoilers go unnoticed, but any alteration to a vehicle's external parameters constitutes illegal modification. Safety is equally critical - improperly installed spoilers may detach at high speeds. We recommend consulting local DMV with photos beforehand, as enforcement standards may vary regionally.

[LeDaniel]

Last year I specifically checked the regulations before installing the rear wing. The basic principle is simple: the wing size shouldn't be exaggerated - no higher than 30cm and no wider than the car body. The material must be lightweight non-metal like ABS plastic, and installation must be secure. The first thing after modification was to register the changes at the DMV with complete vehicle documents. The registration took me half a day, but it was worth it. The worst scenario is failing annual inspection due to unregistered modifications and being required to remove it on the spot - heard Shenzhen enforces this particularly strictly. Daily use isn't affected, but remember not to choose sharp-angle designs, which may not only incur fines but also create accident hazards.