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



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53.1Glazing


The windshield glazing material shall have a 1/4 in. (6 mm) nominal thickness laminated safety glass conforming to the requirements of ANSI Z26.1 Test Grouping 1A and the Recommended Practices defined in SAE J673.

Default


Shaded band

The upper portion of the windshield above the driver’s field of view shall have a dark, shaded band with a minimum luminous transmittance of 5 percent when tested in accordance to ASTM D-1003.

Alternative

Partial band required to allow view for camera and mirror viewing
Alternative

No band required
Default

Two-piece windshield
Alternative

One-piece windshield

IP 54.Driver’s side window


The driver’s side window shall be the sliding type, requiring only the rear half of sash to latch upon closing, and shall open sufficiently to permit the seated operator to easily adjust the street-side outside rearview mirror. When in an open position, the window shall not rattle or close during braking. This window section shall slide in tracks or channels designed to last the service life of the bus. The operator’s side window shall not be bonded in place and shall be easily replaceable. The glazing material shall have a single-density tint.

The driver’s view, perpendicular through operator’s side window glazing, should extend a minimum of 33 in. (840 mm) to the rear of the heel point on the accelerator, and in any case must accommodate a 95th percentile male operator. The view through the glazing at the front of the assembly should begin not more than 26 in. (560 mm) above the operator’s floor to ensure visibility of an under-mounted convex mirror. Driver’s window construction shall maximize ability for full opening of the window.

The driver’s side window glazing material shall have a 1/4 in. nominal thickness laminated safety glass conforming with the requirements of ANSI Z26.1-1996 Test Grouping 2 and the Recommended Practices defined in SAE J673.

The design shall prevent sections from freezing closed in the winter. Light transmittance shall be 75 percent on the glass area below 53 in. from the operator platform floor. On the top fixed over bottom slider configuration, the top fixed area above 53 in. may have a maximum 5 percent light transmittance.

Default

Standard driver’s side window, traditional frame

[Agency to choose from the following options.]


  • full slider

  • egress

  • non-egress

  • egress

  • non-egress

Alternative

Hidden frame (flush “Euro-look”) driver’s side window

[Agency to choose from the following options.]

  • full slider

  • egress

  • non-egress

  • top fixed over bottom slider

  • egress

  • non-egress

Alternative

Quick change operator’s side window

Glazing in the window assembly shall be replaced without removing the window from its installed position on the bus or manipulation of the rubber molding surrounding the glazing. The glazing shall be held in place mechanically by a formed metal extruded ring constructed to last the life of the vehicle.



Standard driver’s side window, traditional frame

[Agency to choose from the following options.]

  • full slider

  • egress

  • non-egress

  • top fixed over bottom slider

  • egress

  • non-egress

Hidden frame (flush “Euro-look”) driver’s side window

[Agency to choose from the following options.]

  • full slider

  • egress

  • non-egress

  • top fixed over bottom slider

  • egress

  • non-egress

IP 55.Side windows

55.1Configuration


Side windows shall not be bonded in place, but shall be easily replaceable without disturbing adjacent windows and shall be mounted so that flexing or vibration from engine operation or normal road excitation is not apparent. All aluminum and steel material will be treated to prevent corrosion.

55.2Emergency exit (egress) configuration


Default

Minimum egress

All side windows shall be fixed in position, except as necessary to meet the emergency escape requirements.

Alternative

Maximum egress

Every window shall be capable of being made an egress window

Default

Standard passenger-side window configurations

[Agency to choose from the following options.]


  • traditional frame

  • hidden frame (flush “Euro-look”)

  • full fixed

  • openable windows with inward-opening transom panels.

Alternative

Quick change passenger-side windows

Designed and constructed to enable a 3M mechanic to remove and replace the glazing in less than 5 minutes. Glazing in the window assembly shall be replaced without removing the window from its installed position on the bus or manipulation of the rubber molding surrounding the glazing. The glazing shall be held in place mechanically by a formed metal extruded ring constructed to last the life of the vehicle.

default

Traditional frame

[Agency to choose from the following options.]


  • full fixed

  • openable windows with inward-opening transom panels

  • openable windows with sliding transom panels

  • openable windows with a fixed transom panel and sliding lower panels

  • openable windows with full-height sliding panels

Alternative

Hidden frame (flush “Euro-look”)

[Agency to choose from the following options.]

  • full fixed

  • openable windows with inward-opening transom panels

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