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 speed limit on a freeway in Idaho is 80 mph rural, 65 mph urban, and a 70 mph truck speed limit. Generally both 2- and 4-lane highways have 70 mph limits, and roads with traffic lights are posted at 60 mph or below.n Pennsylvania the maximum freeway speed limit is generally 65 mph (105 km/h), with a select few sections of rural freeway and parts of the Pennsylvania Turnpike signed at 70 mph (113 km/h). The speed limit on urban freeways ranges from a low of 50 mph in downtown Pittsburgh and Philadelphia to 65 mph in some areas.