The influence of English permeates much of Thai life, particularly in technological areas. Compared with Web 2.0, iPhone mania, and other trends hitting Thailand, the good ol' automobile seems so last century.
But being as cars were the high technology of their time (and with fancy innovations continue to be), many loanwords have become fixed in Thai that relate to the automobile:
เบรก = brake. Used as both noun (เหยียบเบรก "apply the brakes") and verb (เบรกไม่ทัน "couldn't brake in time"). Also used figuratively by extension, meaning to attempt to stop or hinder something. Cf. similar expressions in English like "put the brakes on (a plan, etc.)".
ล็อค = lock. Also spelled ลอค, ล๊อค, etc. Mostly used as a verb in Thai -- อย่าลืมลอครถ "Don't forget to lock the car." The mostly-ubiquitous keyless entry thingamajig is known as a ที่ล็อครถ or more formally, อุปกรณ์ล็อครถ.
เลน = lane (i.e. a painted division of a road). This is what I call a Chameleon English, because it has no indicators in its spelling that it's not a native word. It's widely preferred to the "official" terms ช่อง, ช่องทาง, and most formally ช่องทางจราจร, which you'll see in signs.
ยูเทิร์น = U-turn. The Thai is กลับรถ (or จุดกลับรถ, for the place you make a U-turn), but since all the signs say "U-turn" in English, this is another common one to hear Thais use as a verb, where ยูเทิร์น = "to make a U-turn."
สมอลล์ทอล์ก [สะ-มอ-ท็อก] "small talk" = hands-free headset, i.e. the headphone with dangling mic that you plug in to your cell phone to talk on while driving. Thailand recently made it illegal to use your phone while driving without one, and this is now the generic term for all such corded devices. Not sure of the origin -- a brand name, I'd guess. And if it's a wireless earpiece, it's called a บลูทูธ "Bluetooth". (Some Thais I've talked to don't realize this is the name of the wireless protocol, but then "Bluetooth" is used as a noun for Bluetooth-powered wireless earpieces in English, too.)
I'm sure there are more car-related English loans in Thai. These are just off the top of my head. Any others come to mind?