what are transportation barriers
Please clarify your question. Are you asking about barriers to transportation in general -- major rivers, steep mountains, etc.? Or are you asking about transportation barriers for handicapped people?
Your question is unclear. There are many different types of transportation barriers. However, even though this is not my area of expertise, I searched Google under the key words "transportation barriers" to get these possible sources:
http://www.alltheindustrials.com/search.aspx?q=Barriers&rd=1&brand=
http://www.access-board.gov/recreation/final.htm
http://www.uwm.edu/Dept/ETI/dot.htm
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http://repositories.cdlib.org/lewis/cspp/05/
I hopes this helps. Thanks for asking.
there too stop people that are not aloud in and out of the country going in and out of the country
3 answers