PBS vehicle standards

Vehicles are assessed under the Performance-Based Standards (PBS) scheme according to 16 minimum vehicle performance standards to ensure they are stable on the road and can turn and stop safely. Additionally, there are four infrastructure protection standards.

Below is a short description of the current standards illustrated by a diagram. For more information please refer to the PBS Standards and Vehicle Assessment Rules.

Longitudinal performance (low speed)

Startability

 

 

 

Ability to commence forward motion on specified grade

 Startability Diagram 
Gradeability

 

 

 

Ability to maintain forward motion on specified grade; and achieve a minimum speed on 1% grade

 Gradeability Diagram
Acceleration capability

 

 

 

Ability to accelerate either from rest or to increase speed on a road

 Acceleration Capability Diagram 
Tracking ability on a straight path

 

 

 

The total swept width while travelling on a straight path

Tracking Ability on a Straight Path Diagram

 Directional performance (low speed)

 
Low speed swept path

 

 

 

The maximum width of the swept path in a prescribed 90° low speed turn

Low Speed Swept Path Diagram 
Frontal swing

 

 

 

Maximum lateral outswing of the front outside corner of the prime mover and trailer

Frontal Swing Diagram
Tail swing

 

 

 

Maximum lateral out-swing of the outside rear corner of the truck or trailer as the turn commences

Tail Swing Diagram
Steer tyre friction demand

 

 

 

Maximum steer tyre friction in a prescribed low speed turn

Steer Tyre Friction Demand Diagram
Static rollover threshold

 

 

 

The steady-state level of lateral acceleration that a vehicle can sustain during turning without rolling over

Static Rollover Threshold Diagram
Rearward amplification

 

 

 

Measures the ‘whip crack’ effect of a lane change manoeuvre

Rearward Amplification Diagram
High speed transient offtracking

 

 

 

The lateral distance that the last-axle on the rear trailer tracks outside the path of the steer axle in a sudden evasive manoeuvre

High Speed Transient Offtracking Diagram
Yaw damping coefficient

 

 

 

The rate of decay of the “sway” from the rearmost trailer after a single pulse steering movement.

Yaw Damping Coefficient Diagram

 Infrastructure protection standards

Pavement vertical loading

 

 

 

Degree to which vertical forces are applied to the pavement

Pavement Vertical Loading Diagram

Pavement horizontal loading

 

 

 

Degree to which horizontal forces are applied to the pavement

No Image Available
Tyre contact area

 

 

 

Degree to which tyre contact pressure is distributed over the pavement

No Image Available
Bridge loading

 

 

 

The maximum effect on a bridge measured relative to a reference vehicle

Bridge Loading Diagram