Generating route via a private road

loalf · April 15, 2025, 10:00am

I’m running locally GraphHopper, just followed the instructions and everything works great!!

The problem is I’m trying to get GraphHopper to provide the route between these two points
http://localhost:8989/maps/?point=39.802209%2C2.787781&point=39.802919%2C2.788677&profile=car&layer=OpenStreetMap&custom_model={“priority”%3A[{“if”%3A"car_access%3D%3Dfalse"%2C"multiply_by"%3A"10"}]%2C"speed"%3A[{“if”%3A"car_access%3D%3Dfalse"%2C"limit_to"%3A"1000"}]}

But it refuses to use private roads, what am I doing wrong?

Thanks!

MeirR · April 15, 2025, 10:22am

When you set your hopper.encodedValuesString, you need to allow it to load private roads, rather than using just car_access use car_access|block_private=false

loalf · April 15, 2025, 2:43pm

Thank you so much for your swift response. I’m using the example config file there is in the github repo. I’ve changed this line

github.com/graphhopper/graphhopper

config-example.yml

master


      
          profiles_lm: []
          
          
          #### Encoded Values ####
          
          # Add additional information to every edge. Used for path details (#1548) and custom models (docs/core/custom-models.md)
          # Possible values: road_class,road_class_link,road_environment,max_speed,road_access
          #   surface,smoothness,max_width,max_height,max_weight,max_weight_except,hgv,max_axle_load,max_length,
          #   hazmat,hazmat_tunnel,hazmat_water,lanes,osm_way_id,toll,track_type,mtb_rating,hike_rating,horse_rating,
          #   country,curvature,average_slope,max_slope,car_temporal_access,bike_temporal_access,foot_temporal_access
          graph.encoded_values: car_access, car_average_speed, road_access
          
          #### Speed, hybrid and flexible mode ####
          
          # To make CH preparation faster for multiple profiles you can increase the default threads if you have enough RAM.
          # Change this setting only if you know what you are doing and if the default worked for you.
          # prepare.ch.threads: 1
          
          # To tune the performance vs. memory usage for the hybrid mode use
          # prepare.lm.landmarks: 16

from

graph.encoded_values: car_access, car_average_speed, road_access

to this

graph.encoded_values: car_access|block_private=false, car_average_speed, road_access

as suggested. But I still can’t see it.

This is my custom profile:

{
  "priority": [
    {
      "if": "true",
      "multiply_by": "1"
    }
  ]
}

If I understand it correctly, this custom profile should give all ways the same priority, independently of whether they are private roads or not. What am I doing wrong?

Thanks!

easbar · April 15, 2025, 7:56pm

After you changed the line with the graph.encoded_values did you make sure you ran a new import? You’ll have to change graph.location or delete the previous folder.

That said, the real problem here is probably that this road isn’t private but closed entirely (it is tagged as access=no) Way: 31552740 | OpenStreetMap

loalf · April 15, 2025, 8:01pm

Yes, I have removed the folder before re-importing the data. Is there a way to force GraphHopper to use closed roads? I’m a developer and can code in Java so I am fine changing code and building from source but the codebase is a bit alien to me now. I’m having a look at that right now but we’ll take me a while to familiarise with it.

easbar · April 15, 2025, 9:36pm

With your configuration GraphHopper does not consider this road because of the car_access encoded value. This value is determined in CarAccess.java. To open it there is no built-in switch like the one you used to open private roads, so you have to actually modify the Java code. Keep in mind that access=no (and even an additional motorcar=no) has a rather strict meaning and allowing such roads could not be what you want in other places.