LOS? Was ist LOS? The traffic engineering concept of traffic Level of Service (LOS) is used to rate the acceptability of traffic flow on a road, using scores of A, B, C, D, E and F. Try typing " LOS level of service traffic " and almost ANY country name into your favourite search engine. You will quickly see that LOS is very widely used. OK but so what? The problem is, LOS is a disaster when clumsily applied to cities. It is one of the key ways that traffic planners stumble into the habit of making motor vehicle flows their highest priority. LOS is a key tool that blinds our decision-making processes to the possibility of having smarter goals such as those of the New Mobility Agenda , like accessibility , moving people and goods efficiently not vehicles, or making places great . The San Francisco StreetsBlog has a wonderful series of articles by Matthew Roth on LOS thinking and its alternatives: Paradise LOSt (Part I): How Long Will the City Keep Us Stuck in Our Cars? Para