So there's not much to this one beyond what you can see in the dashcam video. DPD has seen the video but hasn't yet received a report about the incident.
YouTube user Nihilanth posted the video Wednesday afternoon. At first, it features your basic Central Expressway at rush hour with everyone jockeying for space. The pickup wants to get in ahead of the Altima. The Altima doesn't want that. Standard. Then the driver of the pickup sticks what looks like a handgun out the window, easing his commute southbound.