Final answer:
Grab bars should be spaced continuously with the spacing of rungs when positioned horizontally for consistent support and safety.
Step-by-step explanation:
Grab bars must be spaced by a continuation of the rung spacing when they are located in the horizontal position. This requirement ensures that individuals have consistent and reliable support when navigating areas that require grab bars, such as in bathrooms for accessibility or in healthcare facilities. Proper positioning and spacing of grab bars are essential for safety and to comply with regulations such as the Americans with Disabilities Act (ADA).