Possibly a stuck or sticking EGR valve.
Most trucks, buses, and vehicles towing trailers are restricted to a maximum speed of 55 mph on freeways. This limitation is put in place to ensure safety on the roads due to their size and weight posing a higher risk for accidents at higher speeds.
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The speed limit on most freeways in California is 65 miles per hour, but it can vary in certain areas.
Mostly 100kph ( 60 mph ), 110 kph on some freeways. 130kph in the Northern Territory.
Because mixing traffic with such different speed characteristics is a risk no road planner is willing to take.
Not just learning drivers but ALL drivers are required to go the speed limit, or no less than 15 km under the speed limit.
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The posted exit speed for most off-ramps on freeways typically ranges from 25 to 35 miles per hour. This speed is designed to ensure safe navigation of the turn while accounting for varying conditions such as road geometry, traffic volume, and surrounding environments. Drivers should always adhere to the posted signs and adjust their speed based on road conditions and vehicle handling.
The speed in Britain is 70 mph on motorways. In Canada it is 100km on most freeways, and in Italy it is either 130 or 150 depending on which Autostrada.
The purpose of minimum speed limit laws is to keep traffic flowing smoothly on freeways. A very slow vehicle on a freeway can cause a traffic bottleneck.
A gear which causes the transmission output shaft to rotate at a higher speed than the transmission input shaft.
The speedometer and odometer in a 1990 Chevy Astro Van may not work due to a malfunctioning vehicle speed sensor (VSS), which sends speed data to the dashboard. Additionally, issues such as a broken speedometer cable, faulty instrument cluster, or electrical problems can also cause these gauges to fail. Inspecting these components can help diagnose and resolve the issue.