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Calculating traffic route by route, a few major airlines have been quietly rebuilding flight schedules that were cut as much as 20percentt after Sept. 11.
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TFOR uses the infrastructure-free traffic information system (IFTIS) [20] to calculate traffic density between pairs of junctions.
It has its own navigation app, plus a clever partnership with mobile carriers that lets it use data about when phones switch from tower to tower to calculate traffic.
Google assures users that they only use anonymous speed and location information to calculate traffic conditions, and only do so when the user has opted to enable location services on his or her phone.
"For smaller advertisers, a system that only calculates traffic is an easy and inexpensive way to calculate effectiveness," said Eric Eller, director of product marketing at Advertising.com, an online advertising outfit.
He was never late to film shoots because he always calculated traffic and then gave himself an extra thirty to forty minutes in case traffic was bad, so he was always early.
Pollution levels can be estimated by dispersion models from calculated traffic emissions.
We calculated traffic metrics for our study participants, as described in Table 1 [see Supplemental Material (http://www.ehponline.org/members/2008/10735/suppl.pdf)].
We conclude that there is an opportunity to calculate traffic air pollution and its public health impact by mobile phone trajectory mapping.
We were able to calculate traffic exposure for 7,339 of these 7,431 women (99%) due to incomplete address data in 92 subjects.
For each participant's residence, we calculated traffic density by summing the vehicle kilometers of travel (VKT) within a 300-m radius buffer by multiplying the AADT by the length of the road segment for each road segment with AADT values within the buffer, then dividing by the buffered area (0.28 km) to obtain VKT per day per square kilometer (Gunier et al. 2003).
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