In future vehicular networks, the amount of help a driver can get in avoiding dangerous traffic situations or minimizing the potential damage will increase dramatically. Information about weather and road conditions, digital maps and navigation systemsare combined with sensor data from the own vehicle as well as surrounding vehicles. Fast and reliable communication between cars (vehicle-to-vehicle) and/or between a car and a road side unit (vehicle-to-infrastructure) are essential for future vehicle alert systems.

From a network perspective, this means that messages have to be routed from the information source to one or several destinations without too much administrative overhead and delay. Fast topology changes and high mobility in a vehicular networkneed to be considered when developing new routing protocols. In vehicle-to-infrastructure communication, vehicles enter and leave the transmission range ofroadside units at a fast pace and handover techniques need to be adapted in order tomaintain connectivity. The motivation for many of the current approaches is to providethe driver and/or passengers in a vehicle with the quality of service needed formultimedia applications but the ideas behind fast and seamless communication canlikewise be the basis for future vehicle safety application.This report gives a short survey over the work that has been done on adapting multi-hop routing and handover techniques to a vehicular network environment and explainssome of the ideas behind the proposed solutions.