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).
Most highways in the U.S. top out at 75 mph, and there are no longer any roads in the U.S. with no speed limit like Germany's autobahn. Some highways in rural West Texas and Utah have 80 mph speed limits. The Texas Legislature last year approved 85 mph limits for some new stretches of road.