In airports what do the radars do? In what ways do they

In airports what do the radars do? In what ways do they help?

Help planes from crashing

Radar lets the air traffic controllers see exactly where the planes are, when they can't see them with their eyes (too far away or in bad weather). This helps them guide the planes and keep them away from each other.

Radars bounce signals off approaching aircraft, providing speed, distance and direction info. Ground radars provide info about the local location of aircraft. I know the transponder system is replacing radars but systems break and radars will always be an outstanding backup system. It would be foolish for an airport to not have a fully functional radar system as a backup.

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