Įxternally, it differs from the BRDM-1 by having a larger, box-like hull. It has two pairs of chain-driven belly wheels lowered by the driver, which allow trench crossing just like its predecessor, and a centralized tire pressure regulation system, which can be used to adjust the tire pressure of all four tires or individual tires while the vehicle is in motion to suit to the ground conditions. The BRDM-2 has a crew of four: a driver, a co-driver, a commander, and a gunner. The chain drive also turned the vehicle into an 8x8 after a fashion when crossing deep mud, providing more traction than the four main wheels alone could. These were intended to prevent the vehicle from becoming "high centered", or hung up on an obstacle, when traversing a trench or earthwork. Notice the opened shutters, an IR spotlight, left hand side firing port, side TNP-A periscopes and a trim board in the front of the vehicle in its traveling position, as well as the small auxiliary wheels in their lowered position. These drawbacks encouraged the design team to create a new vehicle which would suit the modern battlefield. The vehicle also lacked any kind of special sights, which undermined its function as a reconnaissance vehicle. The vehicle was not fitted with an NBC protection system, and had no night vision equipment by default. The vehicle had no turret and to operate the armament the gunner had to open a hatch and expose himself to enemy fire. After a few years of use by the Soviet Army, the limitations and drawbacks of the BRDM-1 became obvious.
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