Standard Bus Procurement Guidelines - APTAStandards.com
Standard Bus Procurement Guidelines - APTAStandards.com
Standard Bus Procurement Guidelines - APTAStandards.com
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<strong>Standard</strong> <strong>Bus</strong> <strong>Procurement</strong> <strong>Guidelines</strong><br />
5.1.5.1.2 Underbody Clearance<br />
The bus shall maintain the minimum clearance dimensions as shown in the figure “Transit Coach<br />
Minimum Road Clearance” and defined in SAE <strong>Standard</strong> J689, regardless of load up to the gross vehicle<br />
weight rating.<br />
Ramp Clearances. Approach angle shall be no less than 8.5 degrees. Breakover angle shall be<br />
no less than 10 degrees. Departure angle shall be no less than 9 degrees.<br />
The approach angle is the angle measured between a line tangent to the front tire static loaded<br />
radius arc and the initial point of structural interference forward of the front tire to the ground.<br />
The departure angle is the angle measured between a line tangent to the rear tire static loaded<br />
radius arc and the initial point of structural interference rearward of the rear tire to the ground.<br />
The breakover angle is the angle measured between two lines tangent to the front and rear tire<br />
static loaded radius and intersecting at a point on the underside of the vehicle that defines the<br />
largest ramp over which the vehicle can roll.<br />
Technical Specifications 125 10/18/07
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