Okay, well work environment is highly dependent on your company / profession, I dont really know about traffic engineering lol, but if it is for a local company typically long hours and worse conditions than wherever you are from (assuming from the west). However, considering you are foreign and an intern, people will probably have low expectations for you and you wont be under much stress.

Similarly, as far as employee relationships go, depends on the work environment. everyone will be friendly around each other at work, but as many foreigners experience on this sub, it is hard to develop any meaningfull friendships with locals that go outside of the workplace as a foreigner. If you are working with other interns though, I am sure younger people are more willing to meet new people and form new friends outside their established groups through grade school.

Dress code is probably not too different from your home countries definition of business casual, not a woman so cant speak for specifics. But this could change if you are working in "the field" or doing office work as a consultant.

Isnt consulting typically a career you need to be certified for and such? How could you possibly get an internship for a traffic engineer position, in a place you have never experienced the roads of? I only ask as a college student myself who has never heard of someone getting this kind of job in your position. Also, what made you want to come to Hong Kong? Pretty surprising to see someone take up an internship across the world just because.