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).
Based on a simulation, cutting motorway speed limits from 120 to 110 km/h could deliver fuel savings for current technology passenger cars of 12â18 %, assuming smooth driving and 100 % compliance with speed limits.However, relaxing these assumptions to a more realistic setting implies a saving of just 2â3 %.n the other hand, energy and emissions benefits from more stringent speed limits on local roads (e.g. from 50 to 30 km/h) are less clear. The key argument for lower speeds on local roads is therefore the desirability of a safer and more tranquil local environment, rather than environmental considerations.