Cars

0xB74494 contains a pointer. This pointer:
+0 contains a pointer to the first element in the pool.
+8 [DWord] is the maximum number of elements in the pool.
+12 [DWord] is the current number of elements in the pool.
+32 is the vehicle pool start.

For each vehicle in the pool:
+20 contains a pointer to the rotation/position matrix (84 Bytes).
+0 [Float] = X-axis Rotation (Grad)
+4 [Float] = Y-axis Rotation (Grad)
+8 [Float] = Z-axis Rotation (Grad)
+16 [Float] = X-axis Rotation (Looking)
+20 [Float] = Y-axis Rotation (Looking)
+24 [Float] = Z-axis Rotation (Looking)
+48 [Float] = X-axis Position
+52 [Float] = Y-axis Position
+56 [Float] = Z-axis Position
+34 [Word] Vehicle ID from vehicles.ide
+66 [Byte] is the BP/EP/DP/DP (Special Flags) status of the car as follows:
Add these values, and write the sum into +66
1 = N/A
2 = N/A
4 = Bullet-proof
8 = Fire-proof
16 = Damage-proof (from collisons etc)
32 = N/A
64 = N/A
128 = Explosion-proof
+68 [Float] X (East-West) speed
+72 [Float] Y (North-South) speed
+76 [Float] Z (Up-Down) speed
+80 [Float] X (NS) Spin
+84 [Float] Y (EW) Spin
+88 [Float] Z (NW) Spin

Note: Do not get confused about the Spin Angles, these are NOT rotations but the angles of how fast your vehicle is turning in the given axis direction...

(Car addresses continued:)
+140 [Float] Mass (kg) from handling.cfg
+144 [Float] Turn Mass from handling.cfg
+148 [Float] Grip Divider (10.1 = 10 x gGrip / 1 = 1 x gGrip / 100 = g / 100Grip)
+152 [Float] Mass-to-Grip Multiplier. Ie. G Force when flying/during suspension/driving (acceleration towards ground)
+160 [Float] Normalized Grip Level
+164 [Float] CoM X
+168 [Float] CoM Y
+172 [Float] CoM Z
+1064 [Byte] Engine State - Whether the engine is running or stalled (0:Stalled, 16:OK)
+1076 [Byte] Body Color (as in carcolors.dat, black being the 0)
+1077 [Byte] Stripe Color (as in carcolors.dat, black being the 0)
+1078 [Byte] Body Color #2
+1079 [Byte] Stripe Color #2
+1080 [DWord] modding data as in garage info
+1084 [DWord] modding data as in garage info
+1088 [DWord] modding data as in garage info
+1092 [DWord] modding data as in garage info
+1096 [DWord] modding data as in garage info
+1100 [DWord] modding data as in garage info
+1104 [DWord] modding data as in garage info
+1108 [DWord] modding data as in garage info
+1112 [Float] Car Wheel Size from vehicle.ide
+1116 [DWord] Time left for car alarm to sound in ms
+1120 [DWord] Pointer to driver
+1124 [DWord] Pointer to passenger
+1172 [Float] Steer angle 1
+1176 [Float] Steer angle 2
+1180 [Float] Gas pedal
+1184 [Float] Break pedal
+1216 [Float] Health / Car Damage Left (1000: undamaged)
+1272 [Dword] Car Door Locked State (1:open 2:locked)
+1445 [Byte] Car Tire (Left-Front) Status: 1:Flat, 0:OK, 2:Used by planes when landing gear is up
+1446 [Byte] Car Tire (Left-Rear) Status: 1:Flat, 0:OK, 2:Used by planes when landing gear is up
+1447 [Byte] Car Tire (Right-Front) Status: 1:Flat, 0:OK, 2:Used by planes when landing gear is up
+1448 [Byte] Car Tire (Right-Rear) Status: 1:Flat, 0:OK, 2:Used by planes when landing gear is up
+1628 [Byte] Bike Tire (Front) Status: 1:Flat, 0:OK
+1629 [Byte] Bike Tire (Rear) Status: 1:Flat, 0:OK
+2020 [Float] Front-Left suspension height
+2024 [Float] Rear-Left suspension height
+2028 [Float] Front-Right suspension height
+2032 [Float] Rear-Right suspension height

More addresses at: http://gtamaps.net/forum/lofiversion/index.php?t8049.html