Bridge in israel

Hi
Im trying to figure out the layers in an OSM project I downloaded. It has more or less the same layers as in WMS OSM-GB project
http://www.osmgb.org.uk/osm-gb-wiki/index.php/WMS#Layers_Structure

There are the a few layers for bridges:

OSM-GB:access-pre_bridges
OSM-GB:direction_pre_bridges
OSM-GB:bridges_layer0
OSM-GB:bridges_access0
OSM-GB:bridges_directions0
OSM-GB:bridges_layer1
OSM-GB:bridges_access1
OSM-GB:bridges_directions1
OSM-GB:bridges_layer2
OSM-GB:bridges_access2
OSM-GB:bridges_directions2
OSM-GB:bridges_layer3
OSM-GB:bridges_access3
OSM-GB:bridges_directions3
OSM-GB:bridges_layer4
OSM-GB:bridges_access4
OSM-GB:bridges_directions4
OSM-GB:bridges_layer5
OSM-GB:bridges_access5
OSM-GB:bridges_directions5

And Im trying to figure out what is the purpose of the difference lyaers: bridges_layer, bridges_access, bridges_directions.
Thanks a lot

It does not look like OSM raw data. More likely, the WMS server was configured to take certain subsets of the OSM data and present them in the different layers. If my guess is right, you’ll need to check the WMS source.