Final answer:
Rectangular white signs with red lettering usually mean 'No parking.' They are regulatory signs different from Stop, Yield, or Speed limit signs, which have their own unique color and shape to convey different traffic commands.
Step-by-step explanation:
Rectangular white signs with red lettering typically signify regulatory instructions or important rules that must be followed for road safety. In the context of the given choices, the correct answer is (d) No parking.
Rectangular white signs with red lettering usually mean 'No parking.' They are regulatory signs different from Stop, Yield, or Speed limit signs, which have their own unique color and shape to convey different traffic commands.
These signs differ from a Stop sign which is red with white lettering and requires a complete stop. Yield signs are generally triangular with red and white coloring, indicating that a driver must slow down and prepare to stop if necessary.
Speed limit signs are also rectangular but typically feature black lettering on a white background. It is important for drivers to recognize and adhere to these signs to maintain safety and efficient traffic flow.