October 7, 2005 4:00 AM PDT
Driving under the influence of Web maps
The test was far from scientific and the results would surely be different on another day at another time. Although the big portal sites pretty much use the same digital map data providers, namely Tele Atlas and NAVTEQ, the driving directions they provide can be different depending on how much weight the sites give to different criteria--such as traffic conditions, weather and road construction.
Surveying an online street map of San Francisco, I randomly chose a location: A short street called Lopez Avenue that's nestled in the middle of a windy, hilly neighborhood that can be tricky to get to and reached by any of several different routes from my downtown office.
Getting there would require circling a major geographical landmark. It's called Twin Peaks, a 900-foot hill in the middle of the city that's typically covered in fog and usually takes the street smarts of a local to get around.
I started the nearly 12-mile roundtrip at CNET News.com's headquarters, on Second Street in downtown San Francisco.
Yahoo, an early pioneer of online mapping, was first up. Its directions were different from the others, taking me toward the center of the city, then skirting the edge of bucolic Golden Gate Park before landing me at my destination.
It took 20 minutes to get there and 28 minutes to get back, for a total of 48 minutes, instead of the 27 minutes estimated as total travel time on the Web site.
but they got me to my destination.
MapQuest was the only one that sent me onto a highway, which was, fortunately, not crowded because I was driving on it during a midday lull. As a result, it actually saved me some time. If this were rush hour, I'd turn into that scary, foul-mouthed hothead you dread seeing behind you in a traffic jam.
I took Interstate 80/U.S. 101 for about 1.5 miles before being led past a neighborhood called the Mission (note to non-natives: If you're ever looking for a great burrito, this is where you go) and onto upper Market Street, a major thoroughfare that offers a straight shot to Twin Peaks.
Following MapQuest directions the trip took 16 minutes out and 25 minutes back, for a total of 41 minutes, compared with the Web site's estimated 29 minutes.
MSN and Google offered similar outbound directions with minor variations. MSN had me drive around the block from the company headquarters on Second Street to Market, while Google chose to send me around the block to Mission Street, another big street one block away and arguably faster than Market, which can bog down with street trolleys, buses and heavy pedestrian traffic.
I would have had to jump a road divider.
Near my destination, Lopez Avenue, Google took me on a short, circuitous route, with several right turns instead of just one. MSN, on the other hand, confused the heck out of me, and I've lived in San Francisco now for about a decade. A few blocks before Lopez, MSN's directions suggested I drive from Woodside Avenue onto Merced Avenue, two streets that don't connect. I discovered, much to my horror, that I would have had to drive over a street divider to follow those directions.
Using the MSN directions took 24 minutes out and 21 minutes back, for a total of 45 minutes, compared with the estimated 24 minutes total travel time. Google's directions took 16 minutes to get to
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