HI. Speed Limits and Traffic Rules

Owned by iarmstrong
Last updated: Jul 03, 2023
7 min read

Road networks in Haul Infinity have:

  • Default speeds,

  • Maximum speeds and Final speeds,

  • Signposted speeds,

  • Cornering speeds and Ramp speeds.

Wherever two speed settings conflict, the lowest speed will be chosen.

Default Speeds

Whenever a new segment is drawn, it is automatically signposted at the default speeds.

  • Trucks can travel up to (but not more than) the Max Speed.

  • Trucks exit the segment up to (but not more than) the Final Speed.

  • Haul Infinity automatically assigns speed limits to loaded/unloaded trucks based on the inputs in the Limits step > Speed Limits table.

  • Trucks always choose the lowest of all applicable speed limits.

Max Speed

To change the network default Maximum speed:

  1. Go to Tools > Project Settings > General > Network Defaults > Max Speed.

  2. Change the Max Speed to 40 km/h.

Note that even if you specify a higher speed by the speed sign or in the Limit setup step, a lower one will always be applied. So, if you need to increase the speed limit on certain road sections but it is not being implemented, pay attention to this max speed value, which is set to 40 km/h by default.

Max Speed for the selected segment(s) can be set in the Properties panel and in the Grid tab.

Final Speed

The Final Speed is for situations where a truck may (example A) enter a road at 40 km/h, slow down to 15 km/h through an intersection, and then accelerate back to 40 km/hr. In this case, the Max Speed is 40 and the Final Speed is 15.

You may notice that example (B) is basically useless. In fact, it is worse than useless, because if we change a speed limit to 50 km/h in the future, now the entire length of the road will have (by default) 40 km/h slow points at every single segment exit.

Compare this to example (C), where the truck never travels faster than the speed limit, so the default Final Speed has no effect. This is the correct use of the feature. Final Speeds should be specified by exception, not as a rule.

 

Example

Max Speed

Final Speed

Behaviour

Example

Max Speed

Final Speed

Behaviour

A

40

15

The truck can travel up to 40 km/h anywhere on the segment, as long as it slows down to less than or equal to 15 km/h on exiting the segment.

B

40

40

The truck can travel up to 40 km/h anywhere on the segment, as long as it slows down to less than or equal to 40 km/h on exiting the segment.

C

40

99

The truck can travel up to 40 km/h anywhere on the segment, as long as it slows down to less than or equal to 99 km/h on exiting the segment.

Final Speed for the selected segment(s) can be set in the Properties panel and in the Grid tab.

Road Signage

  • The Road Signs menu can be found in the top right panel with the Overlays and Flags menus.

  • Additional signs are available in the To Show dropdown box.

    • To add, expand the To Show dropdown menu and select the signs you want to see in the panel above and be able to apply to the road sections.

Road sign types

Speed Limits

Slow Points and Stop Signs

No Entry signs

Maximum allowable speed across the segment.

Maximum exit speed from the segment.

Speed limit of zero, which prevents trucks travelling along that segment. 

Trucks are restricted to this maximum speed.

Slow point - Trucks slow down to the specified speed approaching this sign (before they exit the segment), then speed up.

Stop and wait - Trucks stop and wait at this sign for the number of seconds.

Trucks cannot enter from this direction (but may exit).

Road signs direction

Applying Speed Signs

There are different ways you can use to set speed limits on your project network.

Dragging signs onto the network

  1. Go to the Network tab and in Nodes panel choose a node and double click on it.

  2. Locate the Road Signs panel to the right of the Viewport.

  3. Select a 20 km/h sign and drag it onto the road approaching the node. 

  4. Speed limit of 20 km/h will be applied to the road approaching this node.

Setting Speed Limits on Selected Segments

  1. Double click the road of interest (example, entry road to the Stockpiles/Crusher, in pit roads, dump ramp).

  2. Right click > Set Speed Limit on Selected Segments > 30 km/h.

  3. Speed limit of 30 km/h will be applied to the segments/road selected.

Setting Final Speed on Selected Points

  1. Double click the point of interest (example, intersection or access road entry).

  2. Right click > Set Final Speed on Selected Points > Slow 20.

  3. Trucks will slow down to 20 km/h when approaching this point.

Changing Speed Limits

To change the speed limit, simply drag and drop other road sign over the existing one, or apply speed limit on the selected segments via right-click option, as describes above.

Removing Road Rules

Stop signs and slow points can be removed from segments via the right click menu. 

  1. Select segment(s) > right click > Clear Slow Point and Stop Signs.

  2. All Slow points and Stop signs will be removed from the selected segments/road.

Example

  1. Find a road with a 40 km/h speed limit.

  2. Drag a 20 km/h sign onto the road -> the sign is visible because there is a speed change from 40 to 20 km/h.

  3. Drag a 40 km/h sign over the top of the 20 km/h sign -> the sign will disappear, because there is no speed change along the segment.

 

Cornering Speeds

The angle of deflection is calculated from the total distance travelled during cornering (the "corner lookahead distance").

  • Cornering measures deflection rather than radius, because we are dealing with digitized points.

  1. Speed limits for corners are set based on inputs in the Setup > Limits > Cornering Speed Limits.

  2. Corner Lookahead Distance is set in the Setup > Settings > Corners.

For angles greater than 70-90 degrees, consider dropping the speed limit to 10 km/hr.

Confirm that the truck is slowing on corners. 

  • Go to the Charts tab and hover the cursor over the curve to see the velocity profile of the selected truck(s).

    • You should see how the truck slows down when passing the corner.

 

Transfer and Terminal Speeds

Note a difference between Transfer Speeds and Terminal Speeds.

  • Transfer speeds are the speeds at which a truck enters onto and exits from the road network.

    • To allow trucks to use the signposted speed limits to traverse from autojoins to the network, rather than coming to a full stop, the Transfer speed shouldn’t be zero.

  • Terminal speeds are the speeds at which a truck arrives at and exits from a node.

    • In almost all projects this should be set to zero, since trucks slow to a stop at the digger and at the dump.

Both are set in Setup > Settings.

 

 

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