254.At an intersection where going straight and turning left are both prohibited, and only right turns areallowed, which sign(s) should be installed? (A) Install only a 'No Left Turn' prohibitory sign; drivers willnaturally choose to turn right. (B) Install a 'Right Turn Only' mandatory sign to positively indicate that onlyright turns are permitted. (C) Install both a 'No Left Turn' and a 'No Straight Ahead' prohibitory signsimultaneously.

255. For a professional small vehicle driver aged 68 or above who wishes to extend their professional driver'sNo. Ans Questionlicense validity until age 70, which of the following regulations is correct? (A) As long as the physicalexamination is deemed qualified, the extension can be granted directly regardless of whether there wasany penalty record in the previous year. (B) The driver must have had no license suspension penalty inthe previous year, pass a physical examination, and submit proof of passing a cognitive function test or acertificate of no dementia; the license may then be renewed or annotated for extension each year. (C)Only a certificate of no dementia needs to be submitted, and a professional driver's license valid for twoyears can be issued at once.

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