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I am travelling by car in the USA (Massachusetts). Am I supposed to respect traffic signs that are upside down?

E.g. on this road, there have been an upside down 25 MPH speed limit for a while, I have no idea whether I am allowed ignore it:

enter image description here

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    Found you goo.gl/maps/OIN6i Looking East, that's definitely a suggestion to follow during the day. – PixnBits Jan 7 '15 at 23:50
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    I see a sign that says 52. Am I the only one? – Floris Jan 8 '15 at 4:50
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    @Floris I could see why that might be confusing since the numbers and letters on this upside down sign might look like "HdW 52". As the original post said, it is supposed to read "25 MPH". Those accustomed to seeing US signs would instantly recognize it as upside down. – Thunderforge Jan 8 '15 at 5:45
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    This is near a university, it was probably turned upside down by a drunk frat boy. – Ryan Jan 8 '15 at 21:15
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    I've recently seen a STOP sign crushed and leaning down touching grass. Should I follow it? – Roko C. Buljan Jan 8 '15 at 22:11
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Yes, any sign posted in the US is intended to be followed unless it explicitly has an X over it or it is covered up. Most likely the top screw of this sign has come loose and no maintenance has been done to fix it. Typically signs that are meant to not be respected are covered with black plastic or a board so they aren't even legible.

However, yellow signs like the one in the picture are advisory and following them exactly is usually not obligatory.

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    The best (and most honest) one of these yellow advisory signs I've ever seen was on the Washington Beltway, where the advisory sign said 55 MPH (which is the road speed limit...) – Alan Munn Jan 7 '15 at 23:30
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    And they're still there! e.g. 39°00'42.46" N 77°03'51.50" W. – Alan Munn Jan 8 '15 at 0:58
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    @John yes I know that's what you meant, and no it's not 65 it's 55. – Alan Munn Jan 8 '15 at 2:05
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    @John I still live in the DC area, drive on that stretch of road fairly regularly, and can confirm that the actual regulatory (white sign) speed limit is 55 there. – cpast Jan 8 '15 at 2:35
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    It seems plausible to me that the advisory sign is more effective for safety purposes, since people interpret it as actually being a safety concern rather than a revenue generator. – R.. Jan 8 '15 at 18:37
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That is definitely still a valid sign, although a lawyer could probably use the fact that the sign was damaged to avoid a related traffic ticket.

It's also a yellow warning sign, which means that the speed limit is still that which was posted on a white sign. You cannot be ticketed for going the speed limit, although the implication is that if you do hit a bicycle or a pedestrian in a crosswalk, you'll be more liable for negligence than if you had slowed down. Basically, if it's a time of day when foot traffic is high in the area, you probably shouldn't be doing 35. But if it's 4am and you're the only one on the road, you definitely don't have to slow down.

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    In urban areas, speed limit signs are typically advisory only -- speed limits apply whether there's a sign there or not. Local codes will generally spell out a blanket speed limit for the city with exceptions for designated streets, and drivers are expected to follow those speed limits whether there are signs or not. Someone I know tried to escape a speeding ticket (45 in a 25 zone) because there the sign was missing, but his defense was rejected because city speed limits apply whether or not they are posted. – Johnny Jan 7 '15 at 23:42
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    @Johnny Honest question: Is every driver supposed to research local speed limits of all cities one might pass through? – neo Jan 7 '15 at 23:48
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    @neo The limit is almost universally 25 or 30, so it's kind of a moot point. – LessPop_MoreFizz Jan 8 '15 at 4:01
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    @neo I guess the answer depends on the country you're in, but it's hard to see how you'd expect to get away with speeding anywhere with that defence. There's no difference between driving laws and any other laws in that regard. "What? You can't smoke a fat joint in the park? You can where I come from!" – bye Jan 8 '15 at 12:45
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    "You cannot be ticketed for going the speed limit". Yes, you can. In California, you can be ticketed for going the posted speed limit if the weather conditions happen to make driving at that speed unsafe. – jamesdlin Jan 8 '15 at 16:13

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