※ 引述《marathons (往 Gilroy 天天发车)》之铭言： : 若是通知单有注明 "TEST ONLY"则必须到挂有 "TEST ONLY"的SMOG检 : 验站去作，理论上 "TEST ONLY"是被DMV 随机抽到的，其实很可能是 : 曾有SMOG未过的前科或较老旧车辆容易被指示去 "TEST ONLY"站。在 : "TEST ONLY" SMOG Check检验站不允许修车，所以通常 "TEST ONLY" : 的SMOG检验费较贵些，因为他们不能赚修车改善排气的钱。 : 这是加州 SMOG Check 系统目前的鸟规则，我以前的旧车就曾被叫去 : "TEST ONLY" ，多付几十元作完全相同的检验，即使我那老车排气每 : 次都轻松通过检验标准也要被欺负，我认为这是歧视老车的恶行。 From DMV website: High Emitter Profile - The majority of vehicles directed to Test-Only stations are selected by application of the High Emitter Profile (HEP), which identifies the vehicles most likely to fail their Smog Checks. The High Emitter Profile (HEP) uses data from several different sources. Some of it comes from the state Vehicle Identification Database (VID), which collects data from each Smog Check performed in California. The VID is used by the Department of Motor Vehicles (DMV), BAR, and other government agencies. In addition, general vehicle data such as make, model-year, vehicle miles traveled, and engine size help define the HEP. This information is used to determine which vehicles are most likely to fail their Smog Checks, especially at Gross Polluter levels--at least two times the emissions level allowed for a particular vehicle. Two Percent Randomly Selected - As required by State law, two percent of the vehicles in the Enhanced Areas are also directed to Test-Only stations for their Smog Checks. These vehicles are selected randomly to evaluate the overall effectiveness of the Smog Check Program. 结论: 大部份会收到test-only的车子，是DMV认为「比较容易fail smog test」的车子 但是在高污染地区有2%的车子会被随机抽中test-only，做为对照组及资料分析用 --

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