A medical certificate supporting a seat belt exemption under reg 231(1)(b)(i) of the Road Traffic Code 2000 (WA) must certify that the person is unable to wear a seat belt, not merely that wearing one causes unpleasant sensations. While no particular form of words is required, the certificate must be clear enough for a police officer to determine compliance on the spot. Examples of sufficient certificates include those certifying physical incapacity to fasten the belt, inability to control the vehicle while wearing it, or serious risk to health from wearing it.
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