Transit Administration) to describe new streetcar transformations which were taking place, and was a translation of the German word Stadtbahn. However, instead of the literal translation of city rail, UMTA used light rail instead. In general, it refers to streetcar/tram systems with rapid transit-style features. It is named to distinguish it from heavy rail, which refers to rapid transit systems as well as heavier regional rail/intercity rail. A few systems such as people movers and personal rapid transit could be considered as even "lighter", at least in terms of how many passengers are moved per vehicle and the speed at which they travel. Monorails are a separate technology. Light rail systems can typically handle steeper inclines than heavy rail, and curves sharp enough to fit within street intersections. They are typically built in urban areas, providing frequent service with multiple-unit trains or single cars. The most difficult distinction to draw is that between light rail and streetcar/tram systems. There is a significant amount of overlap between the technologies, and it is common to classify streetcars/trams as a subtype of light rail rather than as a distinct type of transportation. The two general versions are: The traditional type, where the tracks and trains run along the streets and share space with road traffic. Stops tend to be frequent, and little effort is made to set up special stations. Because space is shared, the tracks are usually visually unobtrusive. A more modern variation, where the trains tend to run along their own right-of-way and are often separated from road traffic. Stops are generally less frequent, and the passengers are often boarded from a platform. Tracks are highly visible, and in some cases significant effort is expended to keep traffic away through the use of special signaling, and even level crossings (or grade crossings) with gate arms. At the highest degree of separation, it can be difficult or impossible to draw the line between light rail and rapid transit, as in the case of London's Docklands Light Railway, which would likely not be called light rail were it not for the contrast between it and the London Underground. Many light rail systems – even fairly old ones – have a combination of the two, with both on-road and off-road sections. In some countries, only the latter is described as light rail. In those places, trams running on mixed right of way are not