Tools > Combine Way

source:trunk/resources/images/combineway.svg Keyboard shortcut: C

Combine several selected ways in one.

  • The order of selection matters, as the remaining way will keep the object id and object history of the first selected way with positive id.
  • The ways need to be connected to each other in their end nodes and need to form a single string otherwise JOSM will show a notification (see below) and refuses the action.
  • All tags with only a single value and all relation memberships from all ways will be added and the Tags/Memberships Conflict Dialog will open if manual decisions are needed. In normal user mode it will additionally warn before adding any tag or membership the ways do not have in common.


refuse combine warning screenshot If the selected ways are not connected in their end nodes and/or do not form a single string a notification is presented with following content:

Could not combine ways
(They could not be merged into a single string of nodes)

Combine Confirmation

Note: Following warnings are not presented in Expert Mode.


If there is any difference in tags or conflicting tag combinations, JOSM presents following warning and ask for confirmation.

The warning lists each conflicting key with its values in brackets and offers two options to hide this warning in future. Choosing "No" will cancel the whole action.

confimation tag warning screenshot


If there is any difference in relation membership or role, JOSM presents following warning and ask for confirmation

The warning lists each involved relation with its name, the number of members and if it is not complete downloaded in brackets and offers two options to hide this warning in future. Choosing "No" will cancel the whole action.

confirmation relation warning screenshot

Tags direction Conflict Dialog

When ways are combined and one of them has to change direction, if on this way there are childnodes with stop, give_way or traffic_signals signs (with keys *:direction): JOSM presents a message and suggest to adapt the forward/backward value (since r17289).

Tags/Memberships Conflict Dialog

If there is any conflicting tag value, membership or role where JOSM cannot find a solution, the Tags/Memberships Conflict Dialog will open up in order to solve the conflict manually.

The dialog is divided into two parts where the upper part is for tags and the lower part is for memberships and roles.

Tags/Membership conflict dialog screenshot


TagsMembership conflict all tags screenshot


On top there are two check boxes to filter the tags:

  • Show tags with conflict only is checked by default to only show the tags not in common. Unchecking will reveal all tags.
  • Show tags with multiple values only shows only the tags with conflicts in values

Background Color

Additionally the background color indicates the conflicts:

white - common tag (no conflict)
green - single value conflict
red - multiple values conflict

Value Column

With the drop down menus in the value column you can solve the conflicts and remove tags. The options are:

  • all single values of the different objects
  • none - the tag will be removed
  • all - all values are used for a key, separated by a semicolon

If the key is representing a quantity like capacity=* or step_count=* there is one more option:

  • sum - sums up all numerical values of the selected objects

Memberships and Roles

TagsMembership conflict lower part screenshot


With the two columns on the far right, Keep and Remove, the decision on the membership can be made.

Background Color

The background colors are:

grey - delete membership, remove object from relation
green - keep membership
red - undecided, needs to be set manually


Roles can be changed by editing the entry in the role column or with the Role text box beneath the membership list.

Tag modified relations

On the bottom line are a check box Tag modified relation with and a text box for Key and Value in order to add a tag to all modified relations by checking the box and entering a key-value combination.

See also

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Last modified 2 months ago Last modified on 2024-03-25T13:07:09+01:00

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