Cycling Level of Service (or CLoS for short) is an audit tool developed by Transport for London. It is designed to assess the quality of cycling provision in existing (and proposed) schemes, with a final score out of 100.
Safety is scored out of 48; Directness is scored out of 8; Coherence is scored out of 6; Comfort is scored out of 20; Atttractiveness is scored out of 12; and Adaptability is scored out of 6.
Good (Dutch-quality) schemes should be scoring between 70 and 80 out of 100.
It can be found in Chapter 2 of TfL's London Cycling Design Standards, and is available in spreadsheet form on the London Cycling Campaign's website.