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).
The UK dual carriageway speed limit is 70 mph (112 km/h) maximum. UK dual carriageways that have the national speed limit of 70 mph do not have speed limit signs. Where dual carriageways have a restricted speed limit such as 50 mph in an urban area for example, speed limit signs will be located alongside the road.