Frequently Asked Questions

 

Why do the message boards sometimes give different temperature reading compared to the sensors in the car?

Temperature measurements made by sensors placed in vehicles are often not adequate compared to the measurements recorded by weather stations. This is influenced by several factors, such as the manner, time, place and accuracy of measurements. Temperature sensors from which the data is displayed on the message boards, are placed in a special radiation shielding to protect from wind and sun at a height of about 3.5 meters (air temperature) and directly in the road surface (surface temperature). Measurements that are displayed consist of several samples, from which a mean value is calculated on a 10 minute basis. Accuracy of temperature mesurement is heavily influenced by placement of the car sensors. Most sensors are mounted underneath the side mirror 60-80 cm over the road surface. Dirt, pollution, salt, and especially moisture affect the change of parameters. Moistened and wet sensors tend to show very different reading. Another important fact is sensor`s inertia. While driving we received the resulst measured over the last few hundred meters. When the car is not in motion the measurement is still influenced by air movement, funes, engine warmth, road sufrace temperature. Furthermore, thermometers installed in cars are generally not characterized by high accuracy. As you can see from above explanations, temperatures measured by the stations and cars should not be compared.


Can I get access to archive data and images from the cameras without being your customer?

Despite the fact that in most cases we support our systems installed by us and present them on our website, we are not their owners. The systems we produced are owned by companies and institutions for which they are installed. Property rights also apply to any data generated by these systems, including images from cameras, meteorological parameters and traffic. Our company may share this information only upon written permission of their respective owners.


What is the dew point?

The dew point is the temperature to which a given parcel of air must be cooled, at constant barometric pressure, for water vapor to condense into water. The condensed water is called dew. The dew point is a saturation point. The dew point is associated with relative humidity. A high relative humidity indicates that the dew point is closer to the current air temperature. Relative humidity of 100% indicates the dew point is equal to the current temperature and the air is maximally saturated with water. When the dew point remains constant and temperature increases, relative humidity will decrease. At a given barometric pressure, independent of temperature, the dew point indicates the mole fraction of water vapor in the air, and therefore determines the specific humidity of the air. The dew point is an important statistic for general aviation pilots, as it is used to calculate the likelihood of carburetor icing and fog, and estimate the height of the cloud base.


What is the wind chill?

Wind chill is the apparent temperature felt on exposed skin due to wind. The degree of this phenomenon depends on both air temperature and wind speed. The wind chill temperature (often popularly called the wind chill factor) is always lower than the air temperature for values where the wind chill formula is valid. In cases where the apparent temperature is higher than the air temperature, the heat index is used instead.

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Contact

 

TRAX elektronik

A. Moryc, M. Tomecki, L. Turczyński sp.j.

ul. Ks.Truszkowskiego 54

31-352 Kraków

tel./fax (012) 626 49 04