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task library
built templatevms-designwith-tool

Vms Legibility Distance

Calculates variable message sign legibility distance from character height using a reduced 40 ft per inch rule of thumb. It converts design speed to ft/s, estimates reading time available, and reports message character capacity from an explicit reading rate.

inputs

3 fields

context

2 archetypes

engine

with-tool

outputs

4 scored fields

contract fields

Parameter Map

3 inputs to 4 scored outputs

  • character_height_in

    float

    VMS character height

    4 to 30in

  • design_speed_mph

    float

    Approach design speed

    10 to 85mph

  • reading_rate_chars_s

    floathidden in hard

    Assumed driver reading rate

    1 to 6chars/s
minimum_legibility_distance_fttol 0.03

Minimum legibility distance

design_speed_ft_stol 0.01

Design speed converted to feet per second

reading_time_available_stol 0.03

Reading time available over the legibility distance

message_length_limit_charstol 0.03

Message length supported by available reading time

visibility contract

Difficulty Ladder

all_giveneasy

Urban VMS with all readability inputs visible

all fields visible
all_givenmedium

Urban or freeway VMS

all fields visible
partialhard

Reading rate hidden in driver-readability context

reading_rate_chars_s

scenario bands

Archetype Atlas

urban_vms

2 contexts

Urban variable message sign on a lower-speed road

character_height_in6 to 14
design_speed_mph25 to 45
reading_rate_chars_s2 to 4

urban-arterial / tunnel-approach

freeway_vms

2 contexts

Freeway variable message sign on a high-speed road

character_height_in12 to 24
design_speed_mph50 to 75
reading_rate_chars_s2 to 4

motorway-mainline / managed-freeway

rendered task

Generation Preview

motorway-mainline-freeway-vms-preview

difficulty
hard
visibility
partial
archetype
freeway_vms
site context
motorway-mainline
instruction excerptvms-legibility-distance_calc.py

visible fields

  • character_height_in12 to 24 in
  • design_speed_mph50 to 75 mph

withheld schema

reading_rate_chars_sminimum_legibility_distance_ftdesign_speed_ft_sreading_time_available_smessage_length_limit_chars
Freeway variable message sign on a high-speed road. motorway-mainline. Required outputs: minimum_legibility_distance_ft, design_speed_ft_s, reading_time_available_s, message_length_limit_chars