4th Observation for the project with considerable findings.
Despite that all the people I observed are males, the observation showed significant documentation about personal space.
Some general conclusions.
People with similar ethnic group will tend to sit closer to each other. Surprisingly, they will also chat randomly to each other even though they are strangers.
Personal space is rather tight (estimated on average >1/3 width, approx. 5-10cm) even though their there are ample empty space around them.
Maybe it is because of the social norm at that environment, because of this closeness, it spark communication between people. Or they did not mind the closeness and hoping for interaction to happen to pass some time.
In cases when some felt the intrusion of personal space, (e.g one when an Indian talks on phone and another Indian man sits down beside him with almost 0 personal space, the first Indian man stood up immediately and walks away talking on the phone.)
They have a common intimate action of patting each other’s thigh while talking. (for both Asians and South Asians)
They extend their limbs to declare more personal space. (e.g with bend arm, or both legs crossed on the seat)
In another case, people place their objects around them to declare more personal space.