Product design question

Design a toll system for highways.

Practice this question out loud. An AI interviewer asks it, follows up like a real interviewer would, and scores your answer. Type or speak.

What this question tests

Product design for critical infrastructure, balancing throughput, user experience, and reliability.

Define the users: daily commuters wanting speed, occasional drivers wanting simplicity, and toll operators wanting accurate collection.
List pain points: physical toll booths cause congestion, and existing transponder systems require upfront purchase and setup friction.
Prioritize a license-plate based electronic tolling system that needs no physical device, reducing friction for occasional drivers.
Design billing: automatic charge to a linked account or invoice by mail for unregistered vehicles, with a grace period before penalties.
Address edge cases: out of state or rental vehicles, and dispute resolution for misread plates.
Define success as reduced average crossing time and lower toll evasion rate compared to the previous system.

Separates frequent commuters from occasional drivers, proposing a no-hardware plate-based system to remove friction for the latter.
Addresses a real edge case, misread plates and disputes, since accuracy directly affects revenue and trust.
Proposes a grace period and mailed invoice fallback rather than assuming every driver has a linked payment account.
Picks crossing time and evasion rate as concrete, checkable success metrics.

Designing only for tech savvy drivers with linked accounts and ignoring rental or out of state vehicles.
Ignoring congestion and throughput, which is the core problem tolling systems must solve.

Chapters of the AI PM course that teach what this question tests.