🚀 go-pugleaf

Scott M. Kozel wrote in message <36C650BA.2A2B@richmond.infi.net>...
>"Douglas A. Willinger" <dougwill@idt.net> wrote:
>>
>> Scott M. Kozel wrote in message <36C637AC.276A@richmond.infi.net>...
>> >cpatz@ibm.net (C. P. Zilliacus) wrote:
>>
>> >The 22-mile Virginia side was 65 mph, the Woodrow Wilson Bridge was 60
>> >mph, the 30 miles from MD 210 Indian Head Highway to MD 97 Georgia
>> >Avenue was 70 mph, the winding section through Rock Creek Park was 50
>> >mph, and thence to the Cabin John Bridge and across to Virginia was 60
>> >mph.  These speed limits seemed to match the design speed of the
>> >highway, based on horizontal and vertical curvature, and stopping sight
>> >distance.
>>
>> As well as the average vehicle of the time, some one third of a century
ago-
>> given the advancements automobiles in general regarding their tires.
brakes
>> and suspensions.  Up to a certain point of traffic density, you can add
5-15
>> mph to the above pre-1973/4 speeds, as attested by the 60-70 mph traffic
>> speeds along the curvy sections of the Capital Beltway between Georgia
>> Avenue and Wisconsin Avenue, and 65-80 mph elsewhere.
>
>Yes, but traffic volumes on the Beltway have tripled since then.  It now
>carries volumes ranging from 190,000 to 225,000 vehicles per day.
>Hence, a 55 to 60 mph speed limit today is appropriate.
>
>--
>Scott M. Kozel     Highway and Transportation History Websites
>Virginia/Maryland/Washington D.C. http://www.richmond.infi.net/~kozelsm
>Philadelphia and Delaware Valley
>http://www.geocities.com/CollegePark/Campus/5961/pennways.html
>