A response of "Grade of a Road"
The grade of the road is essential and vital information to know if you ever encounter one. These grades are usually expressed in a percentage and it explains the slope of the road. The percentage is the rise over run factor of the slope. It is basically the tangent but in a percentage. When having a x%, it means the slope various in an infinite amount of numbers because it is a variable. The road can be completely horizontal or completely vertical. This is important information because it tells the driver to take caution with their speed of the vehicle.
http://www.ezportugal.com/lisbon-portugal/attractions-lisbon-portugal/tram-28-lisbon
This website shows an article about the tram 28 in Portugal and it has a grade of 13.5%. Again, the information of the grade is completely vital because it tells
the conductors when to slow down in order to avoid an accident.
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