3 ms·

I was referring to the rule of seconds. For example, below 40mph it's recommended to leave 2 seconds between you and the car in front. Above 40mph, it's recom

by fouc 5y ago

I was referring to the rule of seconds. For example, below 40mph it's recommended to leave 2 seconds between you and the car in front. Above 40mph, it's recommended to leave 3 to 4 seconds between you and the car in front. The car length in this context is just the length the car travels per second.

Dylan16807 5y ago
> The car length in this context is just the length the car travels per second. Is that how that term is used? Either way, that truck was far under that suggested amount of space when it crossed into the tesla's lane. It was around one second, well under two let alone more. Measuring against the ground, of course, not relative speed. At the speed limit, vehicles are going about 100 feet per second. At the start of the video they appear to be about 3 dashed lines apart (120ft?) and by the time the truck is about to switch lanes they're two dashed lines apart (80ft?)
- fouc 5y ago
  The video was 5 seconds long, the truck was already signalling and slowly merging into the other lane at the beginning of that 5 seconds. It takes a human driver 1.5 seconds to react, there was 3 whole seconds for a human driver to slow down properly.
  - Dylan16807 5y ago
    There definitely was time for the tesla to react. But I'm discussing the truck driver's actions. They signaled for a reasonable amount of time, then cut in front of the tesla despite it not slowing down. And I'm discussing your claim of 5 seconds of gap, because when you follow the ground movement there wasn't that much space between the vehicles, especially once the truck actually crossed between lanes. Honestly the truck driver would have been better off not signalling, or changing lanes immediately upon signalling, because then there would have been much more space and they probably wouldn't have slowed down so much.

3 ms·

I was referring to the rule of seconds. For example, below 40mph it's recommended to leave 2 seconds between you and the car in front. Above 40mph, it's recom

by fouc 5y ago

Dylan16807 5y ago
> The car length in this context is just the length the car travels per second. Is that how that term is used? Either way, that truck was far under that suggested amount of space when it crossed into the tesla's lane. It was around one second, well under two let alone more. Measuring against the ground, of course, not relative speed. At the speed limit, vehicles are going about 100 feet per second. At the start of the video they appear to be about 3 dashed lines apart (120ft?) and by the time the truck is about to switch lanes they're two dashed lines apart (80ft?)
- fouc 5y ago
  The video was 5 seconds long, the truck was already signalling and slowly merging into the other lane at the beginning of that 5 seconds. It takes a human driver 1.5 seconds to react, there was 3 whole seconds for a human driver to slow down properly.
  - Dylan16807 5y ago
    There definitely was time for the tesla to react. But I'm discussing the truck driver's actions. They signaled for a reasonable amount of time, then cut in front of the tesla despite it not slowing down. And I'm discussing your claim of 5 seconds of gap, because when you follow the ground movement there wasn't that much space between the vehicles, especially once the truck actually crossed between lanes. Honestly the truck driver would have been better off not signalling, or changing lanes immediately upon signalling, because then there would have been much more space and they probably wouldn't have slowed down so much.