Uploaded on 2015-04-16 by Guillaume05

![Boston street in winter][1] [1]: https://edxuploads.s3.amazonaws.com/14292059599194433.jpg 1. Visible information: This is a picture I took in Boson last winter. Some visible information is: snow/ice, blue sky (weather was cold and sunny), street names on traffic lights, traffic lights, only 2 cars on this picture (traffic probably not dense) 2. Invisible information: - temperature - traffic density 3. How can traffic density can be use to make it a more livable city? Traffic density can be capture via cameras and/or sensors in the road. Knowing traffic density at different times of the day/week can help make decisions about traffic lights timing, public transportation and street planning.