HI. Truck Speeds

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.

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.

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

• 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.

Placing signs onto the network

1. Select the desired sign type from the Road Sign dropdown in the toolbar.

2. Click on road segments to place a sign. Multiple signs can be placed consecutively without having to reselect.

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

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.

1. Right click on the sign and click Remove Speed Limit Sign

2. For Segments

   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. 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.

3. 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:

1. Go to Setup > Limits > select Truck > Speed Limits tab > Loaded Speed Limits.

2. Change the loaded speed limit to 20 km/h for gradients of -5% and lower.

To set loaded uphill speed limits:

1. Go to Setup > Limits > select Truck > Speed Limits tab > Loaded Speed Limits.

2. 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.

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

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.

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.