Glossary of Data Variables for Fatal and accident causation ... - ERSO

# Variable Value Notes
R54 Speed limit (kph) 3 digit numeric
Work package 5 Database Glossary
This refers to the stated speed limit on signs or other speed limit indicators.
An example of another speed limit indicator applies to roads with 30mph (48kph) limits in the
UK, these are often not signalised but use a system of equally spaced lampposts and no
repeat speed limit signs to highlight this limit.
-888 = Other
-999 = Unknown
R55 Type of speed limit 1 = Permanent
2 = Temporary
For reference:
1mph = 1.61Kph
1Kph = 0.621mph
The speed limit shown on permanent roadway signs or through the use of other speed
indicators remains the same irrespective of date, time or weather etc..
The speed limit is altered at areas where additional protection is required to drivers or road
workers. For example, road works, maintenance or construction sites.
3 = Variable (dynamic)
4 = Advisory
The speed limit is increased or decreased during certain hours of the day or is modified
depending on current traffic conditions, this could be used for rush hour or to alter vehicle
speed prior to an accident scene.
Advisory speed limit is often given for curves.
-888 = Other
-999 = Unknown
R56 Junction 1 = No junction
2 = T junction
The type of junction in the vicinity of
the accident
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