Eventually, the upgrades could do away entirely with the red, yellow ... we go if it's green," said Hajbabaie, whose team used model cars small enough to hold. “But if the white light is active ...

Eventually, the upgrades could do away entirely with the red, yellow and ... we go if it's green," said Hajbabaie, whose team used model cars small enough to hold. "But if the white light is ...

"Green, yellow and black are much more popular in Africa. That may be an anti-colonial reaction to the red, white, and blue of the colonial powers," Kaye says. “They’re also traditionally ...

Eventually, the upgrades could do away entirely with the red, yellow ... we go if it's green," said Hajbabaie, whose team used model cars small enough to hold. “But if the white light is active ...

Eventually, the upgrades could do away entirely with the red, yellow ... go if it’s green,” said Hajbabaie, whose team used model cars small enough to hold. “But if the white light is ...