Carol Adams asked why some streets have two speed limits, one for day and one for night.
"I've noticed the signs especially on Golf Links," Adams wrote. "It would seem that the night speed limit would be higher since the traffic is so much lighter, but it's just the opposite."
The speed-limit is lowered at night on some of the corridors that don't have streetlights, said Michael Graham, spokesman for the Tucson Department of Transportation.
It's a safety precaution because it's harder to see at night, so the signs reflect that, he said.
"There's an old safety slogan that when the sun goes down, so should your speed," he said.
East Golf Links Road was recently illuminated, Graham said, so someone from the department's traffic engineering division will go out to see if the signs should be removed.
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Interstate highway system is 50
This week, a caravan of vehicles will complete a cross-country trip in recognition of the interstate system's 50th anniversary.
According to the Arizona Department of Transportation, Dwight D. Eisenhower took a difficult trip across the country when he was a lieutenant colonel in the Army. Later, when he was president, he secured funding for the interstate system.
Officially, the web of roads that allows us to travel the country is called the "Dwight D. Eisenhower System of Interstate and Defense Highways."
So next time you're driving to Phoenix, Florida or Philadelphia, remember that trip is easier than it used to be.
Arizona has 1,168 interstate miles on interstates 8, 10, 15, 17, 19 and 40. Most recently, the final mile of I-10 opened in 1990 when the Deck Park Tunnel in Phoenix was completed.
The anniversary marks the date Eisenhower signed the Federal Aid Highway Act, June 29, 1956.
RoadQ
Question: Deb Childers said the four-way stop at North La Cholla Boulevard and West Overton Road is a "huge bottleneck." She wants to know when it's scheduled to get a traffic signal.
Answer: The good news is that there is a traffic signal planned for that intersection, said Annabelle Quihuis, spokeswoman for the Pima County Department of Transportation.
"The intersection will have a traffic signal with left-turn additions," Quihuis wrote in an e-mail. "There are utilities that have to be relocated before the intersection can be improved. We anticipate the utilities will be relocated by the fall of 2006, and construction will start soon after."
