Radio Block Center (RBC) is the kernel subsystem of the ground system in high-speed railway signaling system.

无线闭塞中心（RBC）是高速铁路信号系统的地面核心子系统。

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The new body monitors could, if a driving hazard appeared imminent, trigger the car's safety systems to tap the brakes, turn off a radio, block a cellphone from ringing or take other actions.

WSJ: Designing a Car That Takes Your Pulse, Senses If You're Ill

Ford's MyKey system has been engendering teen resentment since the release of the 2010 Focus, allowing parents to limit max speeds and cap radio volume, but parental control doesn't stop there -- the 2011 MyKey can selectively block radio stations.

ENGADGET: Ford MyKey adds radio censorship to further control teen driving habits

Air traffic controllers say the illegal radio broadcasts often block out vital communications with pilots.

BBC: Ofcom said there were 70 such cases in 2006