Introduction to Multimodal Urban Transportation Systems (MUTS)

A: The correct choice preserves functional safety by tying door force compliance to the actual gap and step geometry the passenger sees. Option A ignores that EN 14752 assumptions break when vertical misalignment grows. Option B overstates the limitation; the standard can be applied if the geometry stays bounded. Option D is a paperwork-driven answer that confuses regulatory domains with physical risk.

A: The right answer reduces pitting risk under chloride exposure while staying manufacturable for transit hardware. Option A underestimates crevice retention despite cleaning. Option C fails once the zinc layer is breached at contact points. Option D mixes up mechanical strength with corrosion behavior and adds unnecessary cost and welding risk.

A: The correct estimate matches typical pedestrian flow limits and shows the transfer isn’t instantaneous but not catastrophic. Option A assumes highway-level freedom that doesn’t exist at hubs. Option C jumps straight to crowding without checking density math. Option D drops a real contributor from the dwell budget entirely.

A: The correct sequence prevents energizing a system with unknown fault paths. Option A reverses cause and consequence. Option C checks signals before the physical safety envelope is proven. Option D assumes paperwork substitutes for site conditions.