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The traffic counts on Bellevue Avenue in March and August 1999, in connection with the 4-way stop signs there, provide some elementary insights into traffic patterns in Bellevue.
To start out, here are the data:
Total Traffic East West In Out Diff % In Out Diff % Before 1187 1355 168 14% 1253 1421 168 13% After 1168 1305 137 12% 1194 1401 207 17% Total 2355 2660 305 13% 2447 2822 375 15% Difference -19 -50 -59 -20 Diff, % -1.6% -3.7% -4.7% -1.4%
Total Traffic Total Grand Total In Out Diff % Before 2440 2776 336 14% 5216 After 2362 2706 344 15% 5068 Total 4802 5482 680 14% 10284 Difference -78 -70 -148 Diff, % -3.2% -2.5% -2.8% The first thing we see here is that the traffic in August was down 2.8% from the March level. It's hard to say whether that was because of the new signs or because August is traditionally a vacation month. More likely the latter.
Perhaps more interesting, there is 14% more traffic going out of Bellevue on Bellevue Ave. than coming into Bellevue on Bellevue Ave.
Comparing the Bellevue Ave. traffic outbound less that inbound (i.e., westbound traffic = west station - east station, and eastbound traffic = east station - west station) we obtain the following:
Net EB WB Before 102 234 After 111 233 % of Inbound Before 8% 20% After 9% 20% It appears that the signs didn't make much difference in the totals. In both directions the traffic leaving the neighborhood on Bellevue Ave. exceeds that entering the neighborhood on Bellevue Ave.: The westbound traffic increases 20% between Lamont and Mt Vernon; the eastbound traffic increases 8-9% between Mt. Vernon and Lamont.
Looking at the Bellevue Ave. net traffic as a function of time of day (for the March '99 data) we see:
First, something expected: There is a large net flow of traffic out of the neighborhood, going both east and west, from 7:00 to 9:00 AM. But a lesser outflow continues throughout the day, particularly to the west (Hermitage). There is no evening rush inflow corresponding to the morning rush outflow, just a decrease in the outflow that turns to an inflow at 7:00 PM, after rush hour is over. Go figure.
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Last updated 02/24/02
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