“Censorship is increasingly unpopular in China,” he added. “We know how unpopular it is, because they have to keep the guidelines themselves under wraps.”

A gadfly blog, sarcastically titled Ministry of Truth, has begun to puncture the veil surrounding censorship, anonymously posting secret government directives leaked by free-speech sympathizers. According to the blog’s sources, the Central Propaganda Department issued a directive on Oct. 28, 10 days after the accident, “ensuring there is no more hype regarding the disturbance over traffic at Hebei University.”

On that same day, censors prohibited reporting on six other incidents. One involved another girl’s death in police custody. Others included an investigation of a Hunan Province security official, the sexual dalliance of a Maoming vice mayor, the abandonment of closed pavilions at Shanghai’s World Expo and the increasing censorship of Internet chat rooms.

But the Li Gang case was hard to suppress, partly because it personified an enduring grievance: the belief that the powerful can flout the rules to which ordinary folk are forced to submit. Increasingly, that grievance focuses on what Chinese mockingly call the “guan er dai” and “fu er dai”  the “second generation,” children of privileged government officials and the super-rich.

Realizing the delicacy of the matter, the government tried to shape public reaction in more ways than by simply restricting coverage. After Internet bulletin boards began buzzing with outrage, China’s national television network, CCTV, broadcast an Oct. 22 interview with Li Gang and his son, filled with effusive apologies for the accident. On Oct. 24, the news media reported that Li Qiming, who had been detained by the police the day after the accident, had been arrested.

Police regulations ostensibly bar interviews with detainees. A Baoding police spokeswoman who identified herself as Ms. Zhou said in an e-mail that the network obtained the interview because it had been approved by the local party propaganda office.

Ms. Chen’s survivors were not afforded the same access. In early November, Fenghuang Satellite Television, a news channel based in Hong Kong that is available to some in mainland China, broadcast an angry interview with Ms. Chen’s brother, Chen Lin. On Nov. 4, the Central Propaganda Department banned further news of the interview.