I need your help

"So what should we do next? There seems to be no person who saw an ambulance that day. " Sid said. 

"It may not be an ambulance this time. The murderer has always left us a clue but he always cleverly escapes with something even bigger " Sam said. 

"There are a few cameras on this road. Let's check the footage. " Miss Nair ordered. 

Sid managed to get the footage by the next morning and brought it to the office. The other members gathered in the meeting room quickly. They got footage from eight o'clock to 12.

The video was turned on and everyone's gaze was already on the screen, their eyes glued on it without a blink. There were two angles and the first video just covered a never ending traffic. So they switched to the other one whose camera was facing the road that ends up to the alley from the opposite side. 

"What should I look for in these videos? Any specific car you guys are thinking of? " Sid asked abruptly.