Criteria for designing the drivers cab:1. Driver Comfort.2. Practicality.3. Aerodynamic performance.4. Safety.5. Space6. Reduced weig7. Ease of manufacture & assembly8. Style

Aerodynamics:• Reduces fuel consumption • Reduces wind noise, improving driver comfort• Facilitates safe, predictable handling in side winds

Safety:• Optimum visibility.• Comfortable and stress free driving.• Stability and predictable handling.• Dynamic styling for an assertive road presence

Practicality & first-class comfort:Designing from the driver’s point of view and paying attention to every detail is important.• Space – room to stand, move around, work & relax.• Climatic comfort provided by the integrated climate control system Adjustable seating.• Low noise environment.The spacious interior requirements:• Abundant storage space.• Walk-through cab.• Multifunction bunk for use as a bed, high-level storage or comfortable seating

Drivers Cab Classification•Day Cab •Sleeper cab• Long distance Cab

Steering Wheel Requirements:• Hand wheel diameter (D)• Rim Wheel Diameter (d)• Displacement (M).

Seating:•Minimize the reflections coming from the wind screen and cabin interior.•Reach ability of all controls.•Optimization length& height for smaller and longer persons.•Length and height adjustments requirements.•Seat belt and head rest.•Seat Back inclination of 20 degrees.

Pedal Controls :The design of accelerator brake pedal controls is subject to a number of conditions like :1.Vehicle structure 2.Cost. 3.Comfortable reach. 4. Optimum force exertion Controls should be provided such that operation should be made as stress free with less effort possible.

Foot operated Controls:•Foot controls should provide fatigue free driving:•Sensitivity of operation:•Avoidance of wrong footing:•Rapid transfer of foot between accelerator and Brake.

Hand operated controls:

• Comfortable access.• Controls should be grouped according to use.•Frequently used controls should be placed in the main access area.•Controls should be designed for simplicity and sensitivity without confusion.

Drivers Cab Terminology:

Cab designs are generally classified into following two types:1. “Cab over engine (COE) or forward control

(FC) cab” 2. “Cab behind engine (CBE ) or normal control

(NC) cab or conventional cab”

3. “Cab or driver compartment”

1. “Cab over engine (COE) or forward control (FC) cab” :

This means a vehicle in which all or substantial part of its engine is located under the cab i.e. below driver and co-driver. Also in case of cab over engine vehicles, the steering system

is positioned right at the front of the vehicle.

2. “Cab behind engine (CBE ) or normal control (NC) cab or conventional cab” :

In cab-behind-engine vehicles, the engine transmission assembly is mounted aheadof the cab..

3. “Cab or driver compartment” : The space intended for the driver's exclusive use and contains driver seat, steering wheel, controls, instruments and other devices necessary for driving or operating the vehicle.

Different types of cabs are:

4.“Short conventional cab” : When compared to the normal conventional cab,the short conventional cab has a shortened hood and front fenders and the engine extends into the cab area.5. “Sleeper cab” : Truck with a sleeping compartment in the cab and the cab is incorporating with the sleeper berth for the driver/co-driver.6. “Tilt cab”: Vehicle designed with the engine beneath the cab and having provision for tilting the cab forward to provide easy access to the engine.

7. “Cab to axle of the frame (CA)”: The dimension from the back of the cab to the centerline of the rear axle. For the tandem axle trucks, the distance fromback of the cab to the centerline of the tandem cylinder.8. “Cab to end of the frame (CE)”: The dimension from the back of the cab to the rear of the standard frame.9. “Door” means a sub system of a Truck cab body that permits boarding and alighting for the driver and crew members.

10.“Window” means an aperture in the side or rear of the truck cab to let in light / air.

11. “A pillar” means a structural member integrating the floor, waist rail (bottom ofwindscreen panel) and roof.

Other requirements of Cab:Climb facility :1 The maximum height (a) from ground to top surface of first step shall be 550 mm measured on vehicle in unladen condition.

In addition, the following geometrical specifications shall be fulfilled:Minimum step width shall be 200 mm.Minimum step depth shall be 80 mm.Steps need be provided with anti-slip surface,

First aid box : First Aid kit containing items notified under Rule 138(4) (d) of Central Motor Vehicle Rules, 1989 shall be provided in the truck cab.

Roof luggage carrier :No luggage shall be permitted to be carried on the roof of the cab.

Fire extinguishers : The vehicle shall be equipped with one or more fire extinguishers,