| 41. | These accidents helped pave the way for modern Air Traffic Control.
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| 42. | The Air Route Traffic Control Center was first planned in 1958.
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| 43. | By 1923 the city had installed 31 Acme traffic control devices.
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| 44. | This center provides traffic control services for Minnesota and surrounding states.
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| 45. | There is no air traffic control for much of the region.
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| 46. | ARTS is still in use at many air traffic control facilities.
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| 47. | The partly privatized air traffic control system has experienced frequent problems.
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| 48. | Shut down air traffic control and meat inspection and all that.
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| 49. | The traffic police also use unmarked vans for automatic traffic control.
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| 50. | They were generally used for traffic control and public order duties.
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