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-rw-r--r--src/ground_vehicle.cpp12
1 files changed, 10 insertions, 2 deletions
diff --git a/src/ground_vehicle.cpp b/src/ground_vehicle.cpp
index cc2360d3f..1c706b5c6 100644
--- a/src/ground_vehicle.cpp
+++ b/src/ground_vehicle.cpp
@@ -151,8 +151,16 @@ int GroundVehicle<T, Type>::GetAcceleration() const
}
if (mode == AS_ACCEL) {
- /* Divide by 4 to compensate for the wacky game scale. */
- return (force - resistance) / (mass * 4);
+ /* Easy way out when there is no acceleration. */
+ if (force == resistance) return 0;
+
+ /* When we accelerate, make sure we always keep doing that, even when
+ * the excess force is more than the mass. Otherwise a vehicle going
+ * down hill will never slow down enough, and a vehicle that came up
+ * a hill will never speed up enough to (eventually) get back to the
+ * same (maximum) speed. */
+ int accel = (force - resistance) / (mass * 4);
+ return force < resistance ? min(-1, accel) : max(1, accel);
} else {
return min(-force - resistance, -10000) / mass;
}