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Big Err
Club Racer
Joined: 23 Sep 2006
Posts: 20
Location: Kinross
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 Posted: Fri May 18, 2007 6:48 am
Post subject: Re: Potholes |
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| netwarrior wrote: | How do the sensors that measure road temperature work? Are they based along certain routes and designed to measure road temperature or do they measure air temperature at set points? It's always been a bit of a mystery to me.  |
The road side weather stations can be identified as grey boxes with a mast at the side which may have an anenometer on it, and/or some other unusual looking contraption.
The weather stations monitor air temperatures, surface temperatures (sensor bulit into road surface) and deep temperatures (sensor about half a metre deep in the road. The also measure rain, salt on carriageway surface, wind speeds, wind direction and dew point.
The forecast providers use these stations to monitor and predict localised weather conditions. The roads authority does like-wise, for predicting times when ice or frost is likely to form, how long snow will last for etc etc and the gritting and ploughing action is based on the information.
The weather stations are scattered all over the country, you can start playing spot the weather station on long journeys now! 
| netwarrior wrote: | | Also, why are loose chippings so prevelant in the summer months? Are they a result of incorrect road maintenance techniques or are they designed to be that way? I've never understood why they lay that stuff on road surfaces. it's downright dangerous not only to bikes but to cars also? |
The time to do surface dressing (spray and chip) is when the temperatures are relatively high. Other wise the bitumen sprayed on the road cools too quickly and no stones will stick. After rolling, the road should be swept a number of times (farmers are always glad to see the sweeper - they usually take all the swept chippings), and the weight of traffic on the road adds to the rolling process. Once the loose chips have finally gone the new surface has high grip properties and waterproofing properties to protect the underlying road structure. On a structurally sound road, this treatment is ideal for areas where the grip levels have dropped off. Unfortunately I see this treatment being used as a stop gap - again no cash to fix the roads properly so low cost treatments are used. |
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