Medical workers attended to Wickens, who was awake and alert, before transporting him to the hospital via helicopter. "At least he is alive", said French driver Sebastien Bourdais. He was one those who was treated at the race track medical facility and released.
He also closed to within just 29 points of New Zealand's Scott Dixon, who leads the championship points race with 530 points.
Rossi, the 2016 Indianapolis 500 champion, ended Will Power's bid to win three straight Pocono races. The two bumped together and were launched into the air and over the side fence.
Bourdais said the repairs were "pretty lousy".
Pocono Raceway president Ben May said about 80 feet of fence and a few posts were damaged in the wreck.
After a almost two-hour delay to fix the fencing, the race resumed without another spate of aggressive driving - Graham Rahal tangled with Spencer Pigot as the field was brought to green at the race's start - and ended without another caution.
On Lap 7 of the 500-mile race, Wickens came alongside Ryan Hunter-Reay in the No. 28 Andretti Honda and subsequently spun after contact. Hunter-Reay and Wickens made the initial contact, and Wickens' auto became airborne.
"I was lucky to get out of that one", Hunter-Reay said after being released from the infield medical center. He led 180 of the 200 laps.
IndyCar drivers can steel their will to put any kind of bad news behind them once they get behind the wheel and hit 220 miles per hour in an open cockpit.
British tennis body to vote against controversial Davis Cup reform
The first championship will be held on an indoor hardcourt from November 18-24, 2019, in either Madrid or Lille , France. Some believe that top players will still not turn out to play in the week-long event at the end of an exhausting year.
James Hinchcliff was caught up in the wreck and held his wrists as he slowly left the vehicle.
Hinchcliffe and Wickens form an all-Canadian Schmidt Peterson Motorsports team. He declined to comment to reporters out of respect for Wickens.
It took about 12 minutes for safety crews to get Wickens out of his auto, and he was first taken by ambulance to the infield care center at the track. The impact of the wreck tore out a large section of fencing that IndyCar said would take at least one hour to fix.
It was the latest chilling moment at Pocono: Justin Wilson died from a head injury in 2015 when a piece of debris from a crashed vehicle bounced off the track and hit his helmet.
Robert Wickens went soaring into the fence at Pocono Raceway in a scary wreck that brought the IndyCar race to a halt.
Ryan Hunter-Reay and others shared some insight into what happened out there on the track.
Hunter-Reay, James Hinchcliff and Takuma Sato were among the drivers involved in the wreck. Hinchcliffe was caught up in the wreck and held his wrists as he slowly left the vehicle. It was red flagged and the drivers were permitted to step out of their cars till the fencing was being repaired.
Graham Rahal also addressed the crash in a tweet during the delay.
Rahal started 18th and got into the back of Pigot before the race even got to green. Pigot spun and hit the wall.