Uploaded on 2014-11-05 by Jorim

This is the most obvious visible information. It is invisible to the contemplator what kind of people are seen (e.g. tourists or locals), where the cars are heading and whether the traffic is usually show here. One could improve the traffic situating, which is caused by construction work, by doing the work at night or by providing other means of transports and other routes to the commuters. ![Entry to a tunnel in the centre of Oporto, Portugal][1] [1]: https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-xpa1/t31.0-8/10498433_10203292236004207_3703346174960735065_o.jpg