About this scene
Rush hour traffic, four-lane highway, vehicles bumper-to-bumper at five miles per hour. She's filming herself in the driver's seat. Top down for one window-down moment. The truck cab on her left honks twice in quick succession. She doesn't roll the window back up. She just smiles at the camera and keeps the clip rolling. The traffic moves another fifty feet over the next minute and she stays in the same lane next to the same truck.
What to watch for
The honk is the audio confirmation. Two short blasts, eight seconds apart. She doesn't react verbally. The smile is the response. The traffic conditions are the cover, because slow-moving freeway traffic gives the truck cab a long sustained view of her car. By the time the lane finally moves she has been visible for a full three minutes. Her camera angle catches the truck driver's hand on the steering wheel through her side window.