Q: How do traffic maps on the Internet and mobile traffic apps get their data? Does it come from the roadside traffic cameras, satellite GPS or cellphone tower signals that measure speed and distance? Who's watching us?
Mary Lou Cruz, Miami
A: The Florida Department of Transportation provides traffic video and data to third parties that publish them on their respective websites and mobile apps.
The state charges $1,000 for the first year and $500 per year after the first year. The fees help cover administrative costs and technical support.
The roadside cameras do not record video, and camera operators do not zoom in close enough to identify people in cars. Cameras at intersections are used to detect the presence of vehicles.
"We are interested in traffic incidents, crashes and general traffic patterns," said Daniel Miller, manager of the DOT's traffic management center that covers Broward County.
Q: State Road 84 east from Interstate 95 was resurfaced but they stopped just east of the median strip opening at Canal Drive just east of State Road 7. The pavement markings have worn away and there have been numerous accidents because drivers don't know where to position their vehicles in the median opening. Can the lane markings be repaired while we're waiting for resurfacing to be completed?
Larry Glasser, Dave
A: The area you described is now the responsibility of the contractor rebuilding I-595, who also must maintain the highway, the ramps and S.R. 84 until 2044.
By the end of the year, the area will be repaved along with the rest of I-595 and S.R. 84.
In the meantime, crews were scheduled to refresh the striping on the travel lanes of S.R. 84 near the New River Cove apartment complex last week.
Q: I've traveled Southwest 18th Street in Boca Raton for 20 years and recently a signal was installed at 18th and Edgewood Parkway in front of the Sandalfoot Condominiums. Why? I have never seen an accident and now the flow of traffic is stopped and there is a greater risk of an accident than the lights will prevent.
Marc Ostrov, Boca Raton
A: The intersection met the criteria for a traffic signal in 2007, according to the Palm Beach County Engineer's Office.
It took this long to obtain the right of way to install it and to come up with the funding for design and construction.
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