Those are six seater vehicles that circulate at a speed of . The central old town of Aix is for the most part pedestrianised. There are large underground and overground parking structures placed at regular intervals on the "boulevard exterieur", the predominantly one-way ring road that encircles the old town. Access to the old town is by a series of often narrow one-way streets that can be confusing to navigate for the uninitiated. As in many other French cities, a short-term bicycle hire scheme nicknamed "V'Hello", free for trips of less than half an hour, has recently been put in place by the town council: and has been popular with tourists. As well as overland routes, two "rivers" flow through Aix, the Arc and the Torse, but neither of which can remotely be described as navigable. The local Aix dialect, rarely used and spoken by a rapidly decreasing number of people, is part of the provencal dialect of the Occitan language. The provencal for "Aix-en-Provence" is "Ais de Prouvènço" . Most of the older streets in Aix have names in both Provençal and French. Aix hosted the ninth International Congress of Modern Architecture in 1953. Aix is the home town of the rugby union team Provence Rugby. It played host to the All Blacks during the early stages of the 2007 Rugby World Cup. "Ysabel", the tenth novel of the best-selling Canadian author Guy Gavriel Kay, was set and written in Aix. Italian electroacoustic artist Giuseppe Ielasi's album Aix was produced in Aix-en-Provence, hence the title. This is also the site of an alleged sighting and landing of a UFO in 1981 that is taken seriously by GEIPAN, the department within the French Space Agency responsible for investigating aerospace phenomena. Aix-en-Provence is officially twinned with the following seven cities (in alphabetical order):  In addition, Aix has international cooperations, partnerships and exchanges with the following cities from all over the world:  Aix-en-Provence was the birthplace of: