Annotated Work Zones with Example Code

[wesleyalforddot]

Example Work Zone Scenarios

The following are example work zone scenarios that have been annotated by the Specification Update Subgroup and Technical Assistance Subgroup co-chairs. Throughout it also contains examples of how to encode the events in a GeoJSON file.

Scenario 1: Simple Workzone

"lanes": [  
	{  
		"order": 1,
		"lane_number": 1,  
		"status": "open",  
		"type": "left-lane",  
	},  
	{  
		"order": "2",  
		"lane_number": 2,  
		"status": "closed",  
		"type": "right-lane"
	}  
]

Scenario 2: Lane Shift (simple case)

Event 1

"lanes": [  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 1,  
		"lane_status": “closed",  
		"lane_type": "left-shoulder",  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 2,  
		"lane_status": “open",  
		"lane_type": “left-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 3,  
		"lane_status": “open",  
		"lane_type": “middle-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 4,  
		"lane_status": “open",  
		"lane_type": "right-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 5,  
		"lane_status": “open",  
		"lane_type": "right-shoulder"  
	}  
  ]

Event 2

"lanes": [  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 1,  
		"lane_status": “closed",  
		"lane_type": "left-shoulder",  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 2,  
		"lane_status": “closed",  
		"lane_type": “left-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 3,  
		"lane_status": “open",  
		"lane_type": “left-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 4,  
		"lane_status": “open",  
		"lane_type": “middle-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 5,  
		"lane_status": “open",  
		"lane_type": “right-lane"  
	}  
]  

Scenario 3: Shoulder Closure

Edit: removed due to new approach.

Scenario 4: Road Closure with Detour on Arterial

Scenario 5: Work Zone with Bridge Work Overhead

Scenario 6: Closure of two lanes on divided roadway (short section where two lane are open)

"lanes": [  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 1,  
		"lane_status": “closed",  
		"lane_type": “left-lane",  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 2,  
		"lane_status": “closed",  
		"lane_type": “middle-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 3,  
		"lane_status": “open",  
		"lane_type": “right-lane"  
	}
]

Scenario 7: Mobile Work Zone

"lanes": [  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 1,  
		"lane_status": “closed",  
		"lane_type": "left-shoulder",  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 2,  
		"lane_status": “closed",  
		"lane_type": “left-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 3,  
		"lane_status": “open",  
		"lane_type": “middle-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 4,  
		"lane_status": “open",  
		"lane_type": "right-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 5,  
		"lane_status": “open",  
		"lane_type": "right-shoulder"  
	}  
]

Scenario 8: Two Activities (mainline and ramp/merging lane)

Event 1

"lanes": [  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 1,  
		"lane_status": “open",  
		"lane_type": "left-shoulder",  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 2,  
		"lane_status": “open",  
		"lane_type": “left-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 3,  
		"lane_status": “closed",  
		"lane_type": “right-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 4,  
		"lane_status": “closed",  
		"lane_type": "right-shoulder"  
	}  
]  

Event 2

"lanes": [  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 1,  
		"lane_status": “open",  
		"lane_type": "left-shoulder",  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 2,  
		"lane_status": “open",  
		"lane_type": “left-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 3,  
		"lane_status": “closed",  
		"lane_type": “middle-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 4,  
		"lane_status": “open",  
		"lane_type": “right-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 5,  
		"lane_status": “open",  
		"lane_type": “right-shoulder”  
	}  
]  

Scenario 9: Complex Work Zone with Ramp

Event 1

"lanes": [  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 1,  
		"lane_status": “open",  
		"lane_type": "left-shoulder",  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 2,  
		"lane_status": “open",  
		"lane_type": “left-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 3,  
		"lane_status": “closed",  
		"lane_type": “right-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 4,  
		"lane_status": “closed",  
		"lane_type": "right-shoulder"  
	}  
]

Event 2

"lanes": [  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 1,  
		"lane_status": “open",  
		"lane_type": "left-shoulder",  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 2,  
		"lane_status": “open",  
		"lane_type": “left-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 3,  
		"lane_status": “closed",  
		"lane_type": “middle-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 4,  
		"lane_status": “open",  
		"lane_type": “right-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 5,  
		"lane_status": “open",  
		"lane_type": “right-shoulder”  
	}  
]

Event 3

"lanes": [  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 1,  
		"lane_status": “open",  
		"lane_type": "left-shoulder",  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 2,  
		"lane_status": “open",  
		"lane_type": “left-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 3,  
		"lane_status": “closed",  
		"lane_type": “middle-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 4,  
		"lane_status": “open",  
		"lane_type": “right-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 5,  
		"lane_status": “closed",  
		"lane_type": “right-shoulder”  
	}  
]

Event 4

"lanes": [  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 1,  
		"lane_status": “open",  
		"lane_type": "left-shoulder",  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 2,  
		"lane_status": “open",  
		"lane_type": “left-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 3,  
		"lane_status": “open",  
		"lane_type": “middle-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 4,  
		"lane_status": “closed",  
		"lane_type": “right-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 5,  
		"lane_status": “closed",  
		"lane_type": “right-shoulder”  
	}  
]

Event 5

"lanes": [  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 1,  
		"lane_status": “open",  
		"lane_type": "left-shoulder",  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 2,  
		"lane_status": “open",  
		"lane_type": “left-lane"  
	} ,  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 3,  
		"lane_status": “closed",  
		"lane_type": “middle-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 4,  
		"lane_status": “closed",  
		"lane_type": “right-lane"  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 5,  
		"lane_status": “closed",  
		"lane_type": “right-shoulder”  
	}  
]

Scenario 10: Passing Zones

Event 1

"lanes": [  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 1,  
		"lane_status": “closed",  
		"lane_type": “left-lane",  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 2,  
		"lane_status": “open",  
		"lane_type": “right-lane"  
	}  
  ]

Event 2

"lanes": [  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 1,  
		"lane_status": “open",  
		"lane_type": “left-lane",  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 2,  
		"lane_status": “closed",  
		"lane_type": “right-lane”  
	}  
]

Scenario 11: Cross Over (No Divided Highway)

Event 1

"lanes": [  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 1,  
		"lane_status": “closed",  
		"lane_type": “left-lane",  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 2,  
		"lane_status": “open",  
		"lane_type": “right-lane"  
	}  
]

Event 2

"lanes": [  
  {  
  	"lane_edge_reference": "left",  
  	"lane_number": 1,  
  	"lane_status": “open",  
  	"lane_type": “left-lane",  
  },  
  {  
  	"lane_edge_reference": "left",  
  	"lane_number": 2,  
  	"lane_status": “closed",  
  	"lane_type": “right-lane”  
  }  
]

Event 3

"lanes": [  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 1,  
		"lane_status": “shift-left",  
		"lane_type": “left-lane",  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 2,  
		"lane_status": “closed",  
		"lane_type": “middle-lane”  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 3,  
		"lane_status": “closed",  
		"lane_type": “right-lane”  
	}  
]

Event 4

"lanes": [  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 1,  
		"lane_status": “shift-right",  
		"lane_type": “left-lane",  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 2,  
		"lane_status": “closed",  
		"lane_type": “right-lane”  
	}  
]

Scenario 12: Cross Over with Divided Highway

Event 1

"lanes": [  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 1,  
		"lane_status": “closed",  
		"lane_type": “left-lane",  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 2,  
		"lane_status": “open",  
		"lane_type": “right-lane"  
	}  
  ]

Event 2

"lanes": [  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 1,  
		"lane_status": “open",  
		"lane_type": “left-lane",  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 2,  
		"lane_status": “closed",  
		"lane_type": “right-lane”  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 3,  
		"lane_status": “closed",  
		"lane_type": “right-shoulder”  
	}  
]

Event 3

"lanes": [  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 1,  
		"lane_status": “shift-left",  
		"lane_type": “left-lane",  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 2,  
		"lane_status": “closed",  
		"lane_type": “right-lane”  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 3,  
		"lane_status": “closed",  
		"lane_type": “right-shoulder”  
	}  
]

Event 4

"lanes": [  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 1,  
		"lane_status": “shift-right",  
		"lane_type": “left-lane",  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 2,  
		"lane_status": “closed",  
		"lane_type": “right-lane”  
	},  
	{  
		"lane_edge_reference": "left",  
		"lane_number": 3,  
		"lane_status": “closed",  
		"lane_type": “right-shoulder”  
	}  
]

[wesleyalforddot]

This discussion also relates to issue #78 understanding when to break work zones into separate road events. Pending feedback from the community business rules or the spec will be updated to better define how to separate work zones into different number of road events.

[eli104]

I have a question that may seen basic (or just plain daft) at this point... but I would ask to confirm my thoughts based on a request for clarification from our developers.

As found in Scenarios 3 and 10 above, the Event data is counting the PASSING LANE (opposing travel lane) as lane 1, since it can be used for travel in the positive direction (on this undivided roadway). Am I correct, therefore, that the same holds true in each direction, since a road event is only in a single direction. and therefore lane 1 is the passing lane (opposing traffic) in each direction of an undivided roadway?

I believe I am correct, but need to be clear for our development team. Since our software allows for bi-directional events and/or events which are "related" to one another (e,g. an event that blocks the left lane on either side of the road can be represented as a single event, or two related events to illustrate the effect on travel at the same location... in either direction).

Please advise... thanks

[j-d-b]

Hm, I'm hesitant to agree with the examples which consider the passing lane a "left-lane". In that case there is no way to tell from the WZDx data that it is a passing lane that allows traffic in both directions. I think that could be dangerous.

I would advocate for not including the passing lane in either direction. I'm going to create an issue for this.

[j-d-b]

See #215