The EU rule for new models follows concerns cars put pedestrians at risk because they are too quiet.
EU leaders have been holding marathon talks in an attempt to pick a successor to Jean-Claude Juncker.
Turkey warns Khalifa Haftar's militia it will be a "legitimate target" if the detainees are not freed.
The two leaders meet at the Demilitarized zone, an area that divides the two Koreas.
He is the first North Korean leader to cross the military line into South Korea since the end of the Korean War.
The US president and North Korean leader meet at the demilitarised zone between North and South Korea.
The pro-Beijing protesters waved Chinese flags to oppose the city's huge anti-extradition rallies.
EU Commission chief Jean-Claude Juncker says it is the biggest deal the EU has ever concluded.
A special summit to decide who gets the EU's top jobs stretches into another day.