HI. Speed Limits and Traffic Rules
- iarmstrong
- Todd Eggerman
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:
Go to Tools > Project Settings > General > Network Defaults > Max Speed.
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.
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 |
|---|---|---|---|
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.
Road Signage
The Road Signs dropdown can be found in the toolbar. This can be unpinned and moved to another location if desired.
Displayed signs can be customised in the Configure Signs dropdown box.
To add, expand the Configure Signs 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.
Placing signs onto the network
Select the desired sign type from the Road Sign dropdown in the toolbar.
Click on road segments to place a sign. Multiple signs can be placed consecutively without having to reselect.
Setting Speed Limits on Selected Segments
Double click the road of interest (example, entry road to the Stockpiles/Crusher, in pit roads, dump ramp).
Right click > Set Speed Limit on Selected Segments > 30 km/h.
Speed limit of 30 km/h will be applied to the segments/road selected.
Setting Final Speed on Selected Points
Double click the point of interest (example, intersection or access road entry).
Right click > Set Final Speed on Selected Points > Slow 20.
Trucks will slow down to 20 km/h when approaching this point.
Changing Speed Limits
Changing speed limits can be achieved several ways:
Place another sign on top of the original sign using the Place Road Signs dropdown in the Toolbar.
Right click on the sign and select a new one for the options provided.
Apply speed limit on the selected segments via right-click option.
Removing Road Rules
Stop signs and slow points can be removed in 2 ways.
Right click on the sign and click Remove Speed Limit Sign
For Segments
Select segment(s) > right click > Clear Slow Point and Stop Signs.
All Slow points and Stop signs will be removed from the selected segments/road.
Example
Find a road with a 40 km/h speed limit.
Add a 20 km/h sign onto the road -> the sign is visible because there is a speed change from 40 to 20 km/h.
Add 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.
Loaded and Unloaded Speed Limits
To set loaded downhill speed limits:
Go to Setup > Limits > select Truck > Speed Limits tab > Loaded Speed Limits.
Change the loaded speed limit to 20 km/h for gradients of -5% and lower.
To set loaded uphill speed limits:
Go to Setup > Limits > select Truck > Speed Limits tab > Loaded Speed Limits.
Change the loaded speed limit to 10 km/h for gradients of 9% and greater.
This can be useful for locking trucks in second gear downhill loaded, or first gear uphill loaded, according to your site safety rules and operating practices.
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.
Speed limits for corners are set based on inputs in the Setup > Limits > Unloaded/Loaded Cornering Speed.
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.