When at an intersection without a traffic light, how does a self driving car know that it is safe to cross/turn?

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When at an intersection without a traffic light, how does a self driving car know that it is safe to cross/turn?

In: Technology

Same way a person does. We look for traffic with our eyes; self-driving cars do the same with a variety of sensors. Some are visual, some are radar/sonar, et cetera.