Further notes from the road
Apr. 9th, 2012 12:37 am![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
dr_whomI-95 north of Philadelphia has a bunch of LED-type signs that give the present estimated travel time between two upcoming points on the road—e.g., "TRAVEL TIME AHEAD / PA 63 to I-676 / 15 minutes".
I don't understand why the signs don't give the estimated travel time from here to I-676 or whatever—i.e., from the location of the sign—rather than from PA-63. Presumably someone who's in sight of the sign at any given time will be more interested in how long it'll take them to reach I-676 from where they are now than how long it'll take them from some point further down the road (which they don't necessarily know how long it'll take to get to), right? Is it substantially harder to estimate the travel time from the location of the sign for some reason than from PA-63?
I don't understand why the signs don't give the estimated travel time from here to I-676 or whatever—i.e., from the location of the sign—rather than from PA-63. Presumably someone who's in sight of the sign at any given time will be more interested in how long it'll take them to reach I-676 from where they are now than how long it'll take them from some point further down the road (which they don't necessarily know how long it'll take to get to), right? Is it substantially harder to estimate the travel time from the location of the sign for some reason than from PA-63?
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Date: 2012-04-09 05:20 am (UTC)