Motor racing legend Michael Schumacher is showing signs of improvement after gradually waking from a medically-induced coma, according to European reports. Sources claim the seven-time Formula One world champion is responding "positively" to medical treatment at Grenoble Hospital in France. The German sports star been in an artificial coma since a skiing accident in the French Alps on 29 December (13). Meanwhile, bosses at Mercedes - the team Schumacher drives for - have announced their new cars will display messages of support for the superstar as he continues to fight for his life. And a group of mechanics, pit bosses and drivers for Ferrari, Schumacher's former team, opened the 2014 racing season ahead of the Spanish Grand Prix by gathering for a group photo holding a sign that read #ForzaMichael.