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[106] [153] In some cases, police focused on driving while "influenced", pull over slower quartile sober night-time drivers moving no faster than they can stop within the radius of their headlights; [1] this discourages adjusting speed downward from anything but the posted "maximum speed" permitted by law—which is determined as previously ...
Some authorities regard two seconds as inadequate, and recommend a three-second rule. [4] German law requires a minimum 0.9 second distance but when tested under relaxed conditions [5] researchers found that their test subjects spent 41% of the test time at following distances under 0.9 seconds.
One can also use the 1 in 60 rule to approximate distance from a VOR, by flying 90 degrees to a radial and timing how long it takes to fly 10 degrees (the limit of the course deviation indicator). The time in seconds divided by 10 is roughly equal to the time in minutes from the station, at the current ground speed .
For heavy duty commercial vehicles it is recommended 4-6 seconds following distance for speeds under 30 mi/h (48 km/h), and 6-8 seconds following distance for speeds over 30 mi/h (48 km/h). [9] Rear-end collisions are the number one type of traffic collisions .
Hill descent control helps drivers maintain a safe speed when driving down a hill or other decline. [39] These systems are typically enacted if the vehicle moves faster than 15 to 20 mph when driving down. When a change in grade is sensed, hill descent control automates the driver's speed to descend down the steep grade safely. [39]
In New Zealand, where traffic is on the left, when a road is given a green light from an all-direction stop, a red arrow can continue to display to turning traffic, holding traffic back while a pedestrian crossing on the side road is given a green signal (for left turns) or while oncoming traffic goes straight ahead and there is no permissive right turn allowed (for right turns).
The exceptions to these numbers are slight. Cup Series teams are allowed one extra road crew position at Indianapolis Motor Speedway and road courses, where teams often use multiple spotters because of restricted views. Also, an additional road crew roster spot will be allowed for Xfinity teams at 10 races and Truck Series teams at five. [53]
In order to successfully run out the clock by kneeling, there must be less than 40 seconds on the clock if the opponent has two time-outs, 1 minute 20 seconds if the opponent has one time-out, or 2 minutes if the defense has no time-outs remaining, at the snap on a first down (an additional 40 seconds can be run off if the clock keeps running ...