I looked on my area and saw loads of green routes then I realised bridleways are long green dashes and footpaths short green dashes. So no new ones for me
It all depends which scale map you are looking at.
In brief - on the 1:50000 maps footpaths are tiny red dashes; bridleways are long red dashes, Restricted Byways are red long dashes alternating with short dashes and Byways Open to All Traffic are like the Restricted Byway symbol, but with a short vertical line through the middle of each long dash. Red blobs are 'other route with public access'. This may or may not be accessible for horses; it will (usually) depend largely on what, if any, Right-of-Way status is held by any linking paths. For full details of symbols see
here
On the 1:25000 maps, footpaths are tiny green dashes, bridleways are long green dashes, RBs are long green dashes like a bridleway, but with blobs on one side of each dash, the blob alternating sides from dash to dash. Byways Open to All Traffic are shown as long green dashes like the bridleway, but with a short dash through the middle of each dash. Green blobs show 'other route with public access'. For full details of symbols see
here.
A few permissive bridleways and footpaths are shown on the 1:25000 map, by symbols which are the same as the green ones, but which are in brown.
Diamonds (in green for the 1:25000 scale and red for 1:50000) along the route of a path indicate that it is a named national trail or recreational route eg the South Downs Way, the Dales Way, the Bronte Trail etc.
Be aware that the right of way information on even the most recent ordnance survey maps on-line is only as up-to-date as their most recent update from council definitive maps, which will be AT LEAST several months, and often several years previous - and councils are not exactly known for their speediness in updating the definitive map.
In addition, whatever the status of the path shown on the OS map, and however accurate the map, there is no way that the map shows, or can show, any blockages, obstructions, disputes or modification orders which may be in progress.
But don't let that discourage you; get out there and explore!
If there are unexplored bridleways in your area and you want help or advice in investigating them or advice about reopening them, I'll be happy to help you if you want to PM me.