What might be a reason for issuing a restricted driver license?

A restricted driver license is often issued to individuals who may not meet all the standard requirements for a full driver's license due to specific limitations. In this case, if a driver cannot read highway signs due to a vision problem, it indicates a significant safety concern. The restriction may allow the individual to drive only under certain conditions, such as during daylight hours or within specific geographic areas, to mitigate the risks associated with their impaired vision while still providing them with some driving privileges.

The other scenarios do not align with the rationale for issuing a restricted license. A perfect driving record or the absence of health concerns would generally not necessitate restrictions; instead, they would typically support granting full driving privileges. Similarly, if a vehicle is deemed unroadworthy, this poses a concern related to the vehicle's condition rather than the driver's ability or restrictions regarding their license. Thus, the context of a vision problem directly impacts the driving capabilities and safety regulations, leading to the issuance of a restricted license for the individual.