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From: Jeff Liebermann <jeffl@cruzio.com>
Newsgroups: rec.bicycles.tech
Subject: Re: Traffic Violation?
Date: Tue, 18 Jun 2024 11:53:02 -0700
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On Tue, 18 Jun 2024 11:00:15 -0700, Jeff Liebermann <jeffl@cruzio.com>
wrote:

>Traffic camera on I-880 at 10:30am:
><https://cwwp2.dot.ca.gov/vm/loc/d4/tvb17i880justnorthofsr238.htm>
>Play the video and click on the disappearing icon in the lower right.
>Traffic is moving along, especially in the limited access (inside)
>lane.  Oops.  North bound just came to a congested halt.  If anyone
>wants the speed numbers, use Google Earth to estimate the distance
>between the freeway lights and time how long it takes for the traffic
>to move between two lights.  CalTrans recommended spacing is 25 to 50
>ft.

Oops.  Using Google Earth Pro and the ruler tool, the light poles in
the camera view along the center divider are almost exactly 200 ft
apart.

1 mph = 1.47 ft/sec    t = time (seconds)
200 ft in t seconds = 200 / t / 1.47 = 136 / t mph

For a sanity check, I times how long cars took to go between the light
posts at about 3 seconds.
200 / 3 / 1.47 = 136 / 3 = 45.3 mph
Yeay, that seems about right.

To be able to go 100 mph, a car would need to travel between light
posts in 1.3 seconds.  Watch the video and imagine a car going at that
speed.  Not possible, especially in traffic.

Incidentally, Tom often complains about the poor conditions of
California roads.  Yet, with a road capable of supporting 100 mph
driving, there doesn't seem to be a problem.


-- 
Jeff Liebermann                 jeffl@cruzio.com
PO Box 272      http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann      AE6KS    831-336-2558