Proposal:Lanes as Relations/Examples

Implicit directions

Ways:

• #1, tagged highway=* + oneway=yes

Relations:

• #1, type=lane + lane=vehicle + lane:through=yes + lane:turnleft=yes, #1 as 'highway'
• #2, type=lane + lane=vehicle + lane:through=yes, #1 as 'highway'
• #3, type=lane + lane=vehicle + lane:through=yes, #1 as 'highway'

Lanes with multiple highway members

Ways:

#1-5 (left to right), tagged highway=* + oneway=yes

Relations:

• #1: type=lane + lane=vehicle + lane:turnleft=yes, #3 as 'highway'
• #2: type=lane + lane=vehicle + lane:through=yes, #1,2,3,4,5 as 'highway'
• #3: type=lane + lane=vehicle + lane:through=yes, #1,2,3,4,5 as 'highway'
• #4: type=lane + lane=vehicle + lane:through=yes, #1,2 as 'highway'
• #5: type=lane + lane=vehicle + lane:merge=yes, #3,4 as 'highway'

Open question: how to express that #4 is the "same" lane as #5? Add as a member to the relation?

Lanes with multiple highway members

Ways:

#1 (bottom) and #2 (top), drawn from bottom to top, tagged highway=*

Relations for top way:

• #1: type=lane + lane=vehicle + lane:direction=forward + lane:through=yes + lane:turnleft=yes, #2 as 'highway'
• #2: type=lane + lane=vehicle + lane:direction=forward + lane:through=yes, #2 as 'highway'
• #3: type=lane + lane=vehicle + lane:direction=forward + lane:through=yes + lane:turnright=yes, #2 as 'highway'
• #4: type=lane + lane=vehicle + lane:direction=forward + lane:turnright=yes, #2 as 'highway'

Relations for bottom way:

• #5: type=lane + lane=psv + lane:direction=forward, #1 as 'highway'
• #6: type=lane + lane=psv + lane:direction=backward, #1 as 'highway', #7,8 as 'right_neighbor'

Relations for both ways:

• #7: type=lane + lane=vehicle + lane:direction=backward + lane:through=yes, #2,1 as 'highway'
• #8: type=lane + lane=vehicle + lane:direction=backward + lane:through=yes, #2,1 as 'highway'
• #9: type=lane + lane=sidewalk, #2,1 as 'highway', #1 as 'right_neighbour'
• #10: type=lane + lane=sidewalk, #2,1 as 'highway', #8 as 'left_neighbour'