Brook Trout are not genetically programmed to die after spawning as are the Pacific species of salmon. Spawning is however difficult and dangerous and many fish do die during spawning. The length of the incubation period varies according to the temperature - at lower temperatures the incubation period is longer.
More than half of the total length of the German autobahn network has no speed limit, about one third has a permanent limit, and the remaining parts have a temporary or conditional limit. Some cars with very powerful engines can reach speeds of well over 300 km/h (190 mph).
30 mph UK speed limit. The 30 mph UK speed limit (48 km/h) is also used in residential areas and is the most frequently used within villages, towns and cities. The vast majority of UK roads within urban areas are 30 mph. Unless signs suggest otherwise, UK roads with street lighting will almost always have a speed limit of 30 mph.