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---
titles:
- speed
section: 7advtrains
manual: 'Advtrains Developer''s Manual'
shortdesc: Advtrains speed limit library
seealso:
- speed_lessp(3advtrains)
- speed_set_restriction(3advtrains)
- signal_aspects(7advtrains)
---
# Description
The speed library allows the manipulation of speed limits, which can be represented with
* A non-negative number, which stands for a regular speed limit in m/s, or
* -1 or `nil`, which lifts the speed restriction
The use of other values (in particular, nan and infinity) may result in undefined behavior.
This library is available as `advtrains.speed`.
# Notes
The meaning of `nil` for the speed limit library differs from its meaning in signal aspect tables, where `nil` keeps the current speed limit.
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