In large-scale building like the Milan Outer Eastern Bypass (TEEM), it is essential that due consideration be given to deal with rain, other forms of precipitation and runoff water. Such water has to be properly collected and managed when it falls on the road network. Similarly, it is important to constantly monitor weather conditions along the Bypass. The creation of a system of rainwater collectors is an essential part of preventing unwanted substances from entering the natural water system when something unexpected happens (such as a truck overturning). Likewise, such collectors also mean that any waste deposited on the asphalt by the significant amount of vehicle traffic and collected by rainwater can be dealt with. As such, right across the Bypass, hydraulic infrastructure – wells, pipes and collection tanks – are being built and put in place to direct, collect and manage any form of precipitation during all traffic conditions. Importantly, the functionality and size of the systems have been designed on the basis of the maximum estimated required capacity.

To monitor weather conditions along TEEM, there will be an advance monitoring system in place. This will involve the strategic placement along the motorway of weather sensors that can detect indicators like temperature, humidity, wind speed and direction, precipitation, road temperature and so on. The information thus gathered will mean there is always a complete picture of conditions along the Bypass. Moreover, such data can be used to check adherence with acceptable pollution levels and to plan interventions to improve traveller safety.