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e) Cameras help autonomous vehicles read street signs and the color of traffic lights.

d) But LiDARs, aka light detection and ranging systems, do the important work of sensing and helping cars avoid obstacles, whether that’s a fallen tree, drunk driver, or a child running out into the road.

c) Now, a startup called Luminar Technologies Inc., is unveiling a high-resolution LiDAR sensor that was five years in the making.

a) The startup, which has raised $36 million in seed-stage funding so far, built its LiDAR systems from scratch.

b) That means the company engineered its own: lasers, receivers, chips, packaging and more, rather than incorporating off-the-shelf components.