diff --git a/src/vehicles/Automobile.cpp b/src/vehicles/Automobile.cpp
index 8a771a40..42e2dc2b 100644
--- a/src/vehicles/Automobile.cpp
+++ b/src/vehicles/Automobile.cpp
@@ -252,6 +252,8 @@ CVector vecHunterRocketPos(2.5f, 1.0f, -0.5f);
 CVector vecDAMAGE_ENGINE_POS_SMALL(-0.1f, -0.1f, 0.0f);
 CVector vecDAMAGE_ENGINE_POS_BIG(-0.5f, -0.3f, 0.0f);
 
+#pragma optimize("", off) // a workaround for another compiler bug
+
 void
 CAutomobile::ProcessControl(void)
 {
@@ -835,11 +837,16 @@ CAutomobile::ProcessControl(void)
 
 		if(bAudioChangingGear && m_fGasPedal > 0.4f && m_fBrakePedal < 0.1f && fwdSpeed > 0.15f &&
 		   this == FindPlayerVehicle() && TheCamera.Cams[TheCamera.ActiveCam].Mode != CCam::MODE_1STPERSON){
-			if(GetStatus() == STATUS_PLAYER && pHandling->Flags & HANDLING_IS_BUS){
+			if(GetStatus() == STATUS_PLAYER && !(pHandling->Flags & HANDLING_IS_BUS)){
 				if(m_nBusDoorTimerEnd == 0)
 					m_nBusDoorTimerEnd = 1000;
-				else if(m_nBusDoorTimerEnd > CTimer::GetTimeStepInMilliseconds())
-					m_nBusDoorTimerEnd -= CTimer::GetTimeStepInMilliseconds();
+				else {
+					uint32 timeStepInMs = CTimer::GetTimeStepInMilliseconds();
+					if(m_nBusDoorTimerEnd > timeStepInMs)
+						m_nBusDoorTimerEnd -= timeStepInMs;
+					else
+						m_nBusDoorTimerEnd = 0;
+				}
 			}
 
 			if((m_aSuspensionSpringRatio[0] < 1.0f || m_aSuspensionSpringRatio[2] < 1.0f) &&
@@ -1676,8 +1683,8 @@ CAutomobile::ProcessControl(void)
 		   Abs(m_vecMoveSpeed.y) < 0.005f &&
 		   Abs(m_vecMoveSpeed.z) < 0.005f &&
 		   !(m_fDamageImpulse > 0.0f && m_pDamageEntity == FindPlayerPed()) &&
-		   (m_aSuspensionSpringRatioPrev[0] < 1.0f && m_aSuspensionSpringRatioPrev[1] < 1.0f &&
-		    m_aSuspensionSpringRatioPrev[2] < 1.0f && m_aSuspensionSpringRatioPrev[3] < 1.0f)){
+		   (m_aSuspensionSpringRatioPrev[0] < 1.0f || m_aSuspensionSpringRatioPrev[1] < 1.0f ||
+		    m_aSuspensionSpringRatioPrev[2] < 1.0f || m_aSuspensionSpringRatioPrev[3] < 1.0f)){
 			m_vecMoveSpeed = CVector(0.0f, 0.0f, 0.0f);
 			m_vecTurnSpeed.z = 0.0f;
 		}
@@ -1701,6 +1708,8 @@ CAutomobile::ProcessControl(void)
 	}
 }
 
+#pragma optimize("", on)
+
 void
 CAutomobile::Teleport(CVector pos)
 {
diff --git a/src/vehicles/HandlingMgr.cpp b/src/vehicles/HandlingMgr.cpp
index b8c8566c..cd234cee 100644
--- a/src/vehicles/HandlingMgr.cpp
+++ b/src/vehicles/HandlingMgr.cpp
@@ -300,7 +300,7 @@ cHandlingDataMgr::LoadHandlingData(void)
 					case 11: handling->fTractionBias = atof(word); break;
 					case 12: handling->Transmission.nNumberOfGears = atoi(word); break;
 					case 13: handling->Transmission.fMaxVelocity = atof(word); break;
-					case 14: handling->Transmission.fEngineAcceleration = atof(word) * 0.4f; break;
+					case 14: handling->Transmission.fEngineAcceleration = atof(word) * 0.4; break;
 					case 15: handling->Transmission.nDriveType = word[0]; break;
 					case 16: handling->Transmission.nEngineType = word[0]; break;
 					case 17: handling->fBrakeDeceleration = atof(word); break;
@@ -363,7 +363,7 @@ cHandlingDataMgr::ConvertDataToGameUnits(tHandlingData *handling)
 	handling->fBuoyancy = 100.0f/handling->nPercentSubmerged * GRAVITY*handling->fMass;
 
 	// What the hell is going on here?
-	specificVolume = handling->Dimension.x*handling->Dimension.z*0.5f / handling->fMass;	// ?
+	specificVolume = handling->Dimension.z * (handling->Dimension.x / 2.f) / handling->fMass;	// ?
 	a = 0.0f;
 	b = 100.0f;
 	velocity = handling->Transmission.fMaxVelocity;
diff --git a/src/vehicles/Transmission.cpp b/src/vehicles/Transmission.cpp
index cc994ac6..b3e1af7d 100644
--- a/src/vehicles/Transmission.cpp
+++ b/src/vehicles/Transmission.cpp
@@ -123,7 +123,7 @@ cTransmission::CalculateDriveAcceleration(const float &gasPedal, uint8 &gear, fl
 	else
 		fCheat = 1.0f;
 	float targetVelocity = Gears[gear].fMaxVelocity*speedMul*fCheat;
-	float accel = fEngineAcceleration*accelMul * (targetVelocity - fVelocity)/Abs(targetVelocity);
+	float accel = (targetVelocity - fVelocity) * (fEngineAcceleration*accelMul) / Abs(targetVelocity);
 	if(Abs(fVelocity) < Abs(Gears[gear].fMaxVelocity*fCheat))
 		fAcceleration = gasPedal * accel * CTimer::GetTimeStep();
 	else
diff --git a/src/vehicles/Vehicle.cpp b/src/vehicles/Vehicle.cpp
index 325eb160..c9a77193 100644
--- a/src/vehicles/Vehicle.cpp
+++ b/src/vehicles/Vehicle.cpp
@@ -836,11 +836,11 @@ CVehicle::ProcessWheel(CVector &wheelFwd, CVector &wheelRight, CVector &wheelCon
 				if(IsBike())
 					brake = 0.6f * mod_HandlingManager.fWheelFriction / (pHandling->fMass + 200.0f);
 				else if(pHandling->fMass < 500.0f)
-					brake = mod_HandlingManager.fWheelFriction / m_fMass;
+					brake = mod_HandlingManager.fWheelFriction / pHandling->fMass;
 				else if(GetModelIndex() == MI_RCBANDIT)
-					brake = 0.2f * mod_HandlingManager.fWheelFriction / m_fMass;
+					brake = 0.2f * mod_HandlingManager.fWheelFriction / pHandling->fMass;
 				else
-					brake = mod_HandlingManager.fWheelFriction / m_fMass;
+					brake = mod_HandlingManager.fWheelFriction / pHandling->fMass;
 #ifdef FIX_BUGS
 				brake *= CTimer::GetTimeStepFix();
 #endif