BRUSSELS – European Union countries are getting ready to adopt a common traffic light system to coordinate traveling across the 27-nation bloc, but a return to a full freedom of movement in the midst of the COVID-19 pandemic remains far from reach.In addition to causing the deaths of at least 151,000 EU citizens and plunging the EU’s economy into recession, the coronavirus has also landed a blow to a cherished cornerstone of EU citizenship, the free movement of people.When the virus struck in March, several EU countries decided to close their borders to non-citizens without talking to their neighbors, creating huge traffic jams and slowing down the delivery of much-needed medical equipment.