Desirable Minimum value

A 'desirable minimum' value is a design paremeter used when there is no existing constraint on a proposed or existing cycle facility. 

For instance, a 'desirable minimum' width of a one-way cycleway is 2.5m.

'Desirable minimum' values should be contrasted with 'absolute minimum' values, used when there is a physical constraint present.

For Highways England schemes, designers have to record the reasons why they have had to use an absolute minimum, rather than a desirable minimum.