reflect driving side in U-turn symbol

[MoKob]

For the query, http://map.project-osrm.org/?z=18&center=51.046407%2C13.741493&loc=51.046628%2C13.741708&loc=51.046274%2C13.741273&hl=en&alt=0

the frontend shows a straight arrow:

The response for the same query (https://router.project-osrm.org/route/v1/driving/13.741708,51.046628;13.741273,51.046274?steps=true) shows the indications:

{"intersections":[{"lanes":[{"valid":false,"indications":["uturn"]},{"valid":false,"indications":["left"]},{"valid":true,"indications":["straight"]},{"valid":false,"indications":["straight"]}

The shown arrow should indicate a reverse, which is not the case right now.

/cc @freenerd

[daniel-j-h]

Possibly related: multiple indications per lane are broken #192

[daniel-j-h]

Missing uturn case here:

osrm-frontend/src/itinerary_builder.js

Lines 26 to 45 in a486a1e

	case 'right':
	case 'sharp right':
	icon = 'turn-right';
	break;
	case 'slight right':
	icon = 'bear-right';
	break;
	case 'left':
	case 'slight-left':
	icon = 'turn-left';
	break
	case 'sharp-left':
	icon = 'bear-left';
	break;
	case 'straight':
	case 'none':
	default:
	icon = 'continue';
	break;
	}

[daniel-j-h]

Fixed http://map.project-osrm.org/?z=18&center=51.046407%2C13.741493&loc=51.046628%2C13.741708&loc=51.046274%2C13.741273&hl=en&alt=0

[emiltin]

It would be nice if u-turn icons would indicate a counter clockwise turn (in locations with right-side driving).

[daniel-j-h]

@emiltin the frontend does not know about left- / right side driving. It's not even in the osrm response.

We could add country polygons and do a point in polygon check for the maneuver's location in the frontend. But then again, looking at the currently 40 open issues, I think there are other things to prioritize :)

(Btw if you want to lend a hand feel free to grab some issues, our frontend-fu is somewhat weak :/)

[freenerd]

I did not implement u-turn symbols because of the directions mismatch.

Doing the left/right-hand driving approach is big to do.

One easy thing we could add on the frontend side are u-turns on the left lane have a left-u-turn symbol, u-turns on the right a right-u-turn symbol. This would at least fix the obvious mismatch we have in the screenshot above.

[daniel-j-h]

Related: uturn left vs uturn right in response Project-OSRM/osrm-backend#3077 (v6)