The US on Friday authorised the “voluntary departure” of non-essential staff from its consulate in Shanghai and recommended that Americans not travel to China owing to tough Covid restrictions there.
The families of all US personnel are also allowed to leave, the State Department said.
The agency advised US citizens against travelling to Shanghai, China's economic capital and largest city, “due to Covid-19 related restrictions, including the risk of parents and children being separated".
China has been battling its worst wave of infections since the start of the pandemic and Shanghai has been under total or partial lockdown for two weeks, with more than 25 million people ordered to stay at home.
China, where the coronavirus was first detected in the central city of Wuhan in late 2019, is among the last remaining places in the world to enforce a zero-Covid approach to the pandemic.
In Shanghai, the government implemented a policy of separating coronavirus-positive children from parents who tested negative, but then had to relax it following criticism.
Ways to control drones
Countries have been coming up with ways to restrict and monitor the use of non-commercial drones to keep them from trespassing on controlled areas such as airports.
"Drones vary in size and some can be as big as a small city car - so imagine the impact of one hitting an airplane. It's a huge risk, especially when commercial airliners are not designed to make or take sudden evasive manoeuvres like drones can" says Saj Ahmed, chief analyst at London-based StrategicAero Research.
New measures have now been taken to monitor drone activity, Geo-fencing technology is one.
It's a method designed to prevent drones from drifting into banned areas. The technology uses GPS location signals to stop its machines flying close to airports and other restricted zones.
The European commission has recently announced a blueprint to make drone use in low-level airspace safe, secure and environmentally friendly. This process is called “U-Space” – it covers altitudes of up to 150 metres. It is also noteworthy that that UK Civil Aviation Authority recommends drones to be flown at no higher than 400ft. “U-Space” technology will be governed by a system similar to air traffic control management, which will be automated using tools like geo-fencing.
The UAE has drawn serious measures to ensure users register their devices under strict new laws. Authorities have urged that users must obtain approval in advance before flying the drones, non registered drone use in Dubai will result in a fine of up to twenty thousand dirhams under a new resolution approved by Sheikh Hamdan bin Mohammed, Crown Prince of Dubai.
Mr Ahmad suggest that "Hefty fines running into hundreds of thousands of dollars need to compensate for the cost of airport disruption and flight diversions to lengthy jail spells, confiscation of travel rights and use of drones for a lengthy period" must be enforced in order to reduce airport intrusion.
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