TVR normally stands for "Traffic Volume Report" or "Traffic Violation Report".

Based on the Asker information this phrase was found on a map of Japan. I did Google search and found some Hwy 104's in Japan, but my bet is on the one running in Okinawa, since there are US military bases and actually the Hwy 104 there runs through in the middle one of the bases.

I have some friends who have lived in US bases, and long time ago, one of them told me that they get their own traffic tickets for speeding within/around a base.

This is totally my speculation, but these three pieces all come together and somehow brought me a conclusion that this phrase on a Japan map is a message for people from US forces to warn that they get ticketed if they drive Hwy 104 during its construction/reconstruction.

I am attaching a URL for a sample TVR used within a US base that I came across while searching on Google.

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Note added at 2 days2 hrs (2013-04-14 08:03:44 GMT)
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It is Camp Hansen I am talking above.

Hwy 104 in Okinawa (JA Wikipedia)
http://ja.wikipedia.org/wiki/沖縄県道104号線

Google Map - Camp Hansen, Japan
https://maps.google.com/maps?q=Camp Hansen, Japan&hl=en&sll=...


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Note added at 2 days10 hrs (2013-04-14 15:42:14 GMT)
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And here is the link to the other question sled the Asker made under eng>eng category.
http://www.proz.com/kudoz/English/business_commerce_general/...

In the discussion section there, an additional piece of information "This is a map on dam construction site in Japan" Asker says...