Design a Traffic Signal System

Build the controller for one signalized intersection, the kind a city runs thousands of. Roads get their green in phases, a yellow always sits between a green and a red, two conflicting roads are never green together, and a clock you tick drives it all.

How the round runs

Medium · 5 stages · 5 questions · 60 min

~6 min

Requirements Gathering

lists

~3 min

Identifying Core Entities

cards

~14 min

Designing Classes & Relationships

diagram

~28 min

Code Implementation

code

~9 min

Deep Dives

code

Set up your round

Level

Interviewer

Duration

Junior · Standard · 60 min