Stop Line Interpretation about nuscenes-devkit HOT 3 OPEN

1. I believe TURN_STOP is used for pedestrian crossings which are at turns

2. A line, by definition, does not have a direction (in contrast, a traffic light has an orientation denoted by the direction in which its set of bulbs are facing)

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Hi,

thank you for the answer!
For 1), this is a plausible answer, however most of the time if I check the stop line of type 'TURN_STOP', there is no ped_crossing token. For example: {'token': '04baaab2-94a5-4734-89a6-113ef5861d75',
'polygon_token': '78bd8693-014f-4bcb-afb1-32cfffd9d3d6',
'stop_line_type': 'TURN_STOP',
'ped_crossing_tokens': [],
'traffic_light_tokens': [],
'road_block_token': '',
'exterior_node_tokens': ['6d88e398-7ef2-4962-a96e-0296ff7eed86',
'e1a7b327-fad1-4b80-bee3-cb592984d276',
'b63cd317-b048-419d-9f93-c5412cd69e86',
'f1496b72-5a11-48a9-9bb6-cae29cbb34e1',
'37a286ec-6e56-4e9d-81cf-3b4c92de2e76',
'71890aeb-93c6-4983-843e-722824205cea',
'75fd19cb-5f3a-44e9-9478-b0cf46a754b3'],
'holes': [],
'cue': []}

For 2), this is true for PED_CROSSINGs, but for example STOP_SIGNs should have an orientation.

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1. Pls take a look at the maps tutorial:

   ped_crossing_tokens denotes the association information if the stop_line_type is PED_CROSSING.

   That is why TURN_STOP does not come with ped_crossing_tokens

2. In nuScenes, I think a stop sign is treated the same as a stop line, in that it is not given an orientation

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