Apta (Draft) Specification For: 30-ft, 35-ft, 40-ft, 45-ft, 60-foot (articulated) Transit Buses

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5.1Bus length

For ease of use, the following tolerances will be allowable for each given bus length. Bus length is determined as the measurement from bumper to bumper.

30-ft bus: 30 ft to 34 ft, 11 in.
35-ft bus: 35 ft to 39 ft, 11 in.
40-ft bus: 40 ft to 44 ft, 11 in.
45-ft bus: 45 to 47 ft
60-foot (articulated): 59 to 65 ft

5.2Bus width

Default

102-in. width bus

Body width shall be 102 in. (+0, -1 in.).

Alternative

96-in. width bus

Body width shall be 96 in. (+0, -1 in.).

5.31.3 Bus height

Default

Maximum overall height

Maximum overall height shall be 140 in. (356 cm), including all rigid, roof-mounted items such as A/C, exhaust, fuel system and cover, etc.

Alternative

Maximum height

Maximum height shall be specified by Procuring Agency.

5.41.4 Floor height

Default

The floor height shall not exceed 16.5 in. (419 mm) at either doorway without kneeling and shall not exceed 15.5 in. at the step. A maximum of two steps is allowed to accommodate a raised aisle floor in the rear of the bus.

ALTERNATIVE

Center door on articulated bus may have more the two steps.

Alternative

High floor bus floor height shall not exceed 35 in. (889 mm) at either doorway, without kneeling.

5.5Underbody clearance

The bus shall maintain the minimum clearance dimensions as shown in Figure 3 and defined in SAE Standard J689, regardless of load up to the gross vehicle weight rating.

5.6Ramp clearances

The approach angle is the angle measured between a line tangent to the front tire static loaded radius arc and the initial point of structural interference forward of the front tire to the ground.

The departure angle is the angle measured between a line tangent to the rear tire static loaded radius arc and the initial point of structural interference rearward of the rear tire to the ground.

The breakover angle is the angle measured between two lines tangent to the front and rear tire static loaded radius and intersecting at a point on the underside of the vehicle that defines the largest ramp over which the vehicle can roll.

Breakover Angle (to not exceed) Table 1
Angle	30- to 45-ft Bus	60-ft Bus
Approach	8.6 degrees (min.)	9 degrees (min.)
Front breakover	8 degrees (min.)	10.2 degrees (min.)
Rear breakover (articulated only)	n/a	8.7 degrees (min.)
Departure	8.7 degrees (min.)	9 degrees (min.)

5.7Ground clearance

Ground clearance shall be no less than 9 in., (8 in. at jacking pad) except within the axle zone and wheel area.

Axle zone clearance, which is the projected area between tires and wheels on the same axial centerline, shall be no less than 5.4 in.

Wheel area clearance shall be no less than 8 in. for parts fixed to the bus body and 6 in. for parts that move vertically with the axles.

TRANSIT BUS MINIMUM ROAD CLEARANCE

Figure 3

5.8Floor height

Height of the step above the street shall be no more than 16 in. measured at the centerline of the front and rear doorway. The floor may be inclined along the longitudinal axis of the bus, and the incline shall not exceed 3.5 degrees off the horizontal except locally at the doors where 2 degree slope toward the door is allowed. All floor measurements shall be with the bus at the design running height and on a level surface and with the standard installed tires. A maximum of two steps is allowed to accommodate a raided aisle floor in the rear of the bus.

5.9Interior headroom

Headroom above the aisle and at the centerline of the aisle seats shall be no less than 78 in. in the forward half of the bus tapering to no less than 74 in. forward of the rear settee. At the centerline of the window seats, headroom shall be no lower than 65 in., except for parcel racks and reading lights, if specified. Headroom at the back of the rear bench seat may be reduced to a minimum of 56 in., but it shall increase to the ceiling height at the front of the seat cushion. In any area of the bus directly over the head of a seated passenger and positioned where a passenger entering or leaving the seat is prone to strike his or her head, padding shall be provided on the overhead paneling.

5.10Aisle width

The minimum clear aisle width between pairs of transverse seats with all attached hardware shall be at least 22 in. (558 mm).

The aisle width between the front wheelhouses shall be at least 35.5 in. (902 mm), and the entire area between the front wheelhouses shall be available for passengers and mobility aid devices.

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