You're probably on the border of the warning going off. Remember, your tires heat up when you're driving also. If 29 is the bottom, they could have heated up to 32 or 33 without a whole lot of effort. Either way, get the cold tire pressure up. If you want to test it, let more air out of one of the tires and drive around for awhile. A short distance with lower pressure isn't going to destroy your tires.
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