The behavior you describe, where drivers are reluctant to let others merge into their lane when a lane is closing, can be attributed to a few factors:
Traffic congestion and impatience: In areas with heavy traffic, merging can slow down the flow of traffic, which can lead to frustration and impatience among drivers. Some drivers might be reluctant to let others merge because they want to maintain their current speed and avoid any slowdown.
Self-interest and competition: Some drivers may adopt a more competitive mindset on the road, feeling that allowing others to merge might put them at a disadvantage or make them lose their position in the traffic flow. This self-preservation mindset can lead them to be less willing to let others merge in front of them.
Lack of trust: In some cases, drivers might not trust that the merging driver will merge safely and smoothly, or they fear the merging driver will not properly adjust their speed to match the flow of traffic, potentially causing a dangerous situation.
Road rage and discourtesy: Unfortunately, road rage and discourteous behavior can be prevalent on the roads. Some drivers may intentionally not allow others to merge as a display of aggression or frustration, even if it's not safe or courteous.
Limited awareness: Some drivers might be unaware of the principle of "zipper merging," where vehicles take turns merging at the lane closure point. They might not realize that by allowing merging in a cooperative manner, traffic can flow more efficiently.
It's important to note that not all drivers exhibit this behavior, and many do understand the importance of cooperation and courtesy on the road. The behavior of drivers can vary depending on the location, local driving culture, and individual attitudes. Promoting safe and cooperative driving practices through public awareness campaigns, education, and law enforcement efforts can help improve the overall driving experience for everyone.