page_title: Junctions (software)
section_title: ARCADY
hierarchical_section_title: Junctions (software) / ARCADY
caption_attribution_description: English: Key Street Roundabout. Junction of the A2 with the A249 Sheppey Way. The A249 goes under the roundabout (and flooded badly soon after opening) with a slip roads up from the north bound carriageway and down onto the south bound. Other travellers must use the next northerly junction.
context_page_description: Junctions is a software package by Transport Research Laboratory. It incorporates ARCADY and PICADY which were previously separate programs marketed by TRL.
context_section_description: ARCADY is the acronym for (Assessment of Roundabout Capacity And DelaY). This software, produced by the Transport Research Laboratory (UK), models traffic capacity, queues and delays at roundabouts.  The software is largely based on empirical relationships between roundabout geometry and capacity, which were established as the result of extensive research carried out on existing roundabouts  on the UK road network, as well as controlled test track facilities over a period of over a decade. 
  The program is used by traffic engineers when assessing existing layouts or when analysing the impacts of proposed design changes. Estimates of annual accident frequencies can also be obtained.
  The capacity and safety relationships which ARCADY utilises are discussed in the UK's Design Manual for Roads and Bridges.
  RODEL is similar to ARCADY and utilises TRL equations under licence from TRL.
caption: ARCADY is used to assess roundabout designs. Traffic circulating on the roundabout has priority over traffic entering the roundabout from the approach roads.
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