Singh's single passenger had not seen the crash because he had been on his mobile phone.
Singh told Gaffney he had slept well the night before for six hours, after two days off work, and had no medical issues or eyesight problems.
Called as an expert for the defence, forensic engineer Dr Tim Stevenson said based on the CCTV footage he was "fairly confident" the speed of the car at time of impact was about 44.5km/h.
The car, which was found to be without mechanical fault, braked well, he said.
"I wouldn't expect any car to stop much quicker unless it is a supercar."
Stevenson said that based on his calculations, the car would have been just out of Kopa's peripheral sight prior to the impact.
Kopa did not take any evasive action that he could discern, he said.
He concluded that the primary cause of the crash was Kopa's decision to cross the road.
After Kopa's death Auckland Mayor Phil Goff, a friend of Kopa and his family, published a tribute to him.
"I had a chance to say my goodbyes to Dann ... It is absolutely heartbreaking for Calli to lose the love of her life and for four little girls to grow up without their dad," Goff said.
Judge Butler has reserved his decision, to be released later this week.