Aging, unreliable runway safety device leaves U.S. airports vulnerable

https://www.seattletimes.com/business/aging-unreliable-runway-safety-device-leaves-u-s-airports-vulnerable/?utm_source=RSS&utm_medium=Referral&utm_campaign=RSS_boeing-aerospace 

The technology — which tracks vehicles on or near runways to alert controllers before impending crashes — often uses decades-old radar equipment.