extremely abrupt Deceleration, negative speeds - alexandria testcase

[pierre fermat]

Hello All

I am running the v4 of transims on the alexandria (4.0.3) test case.  Slowdown probability is disabled. I am seeing the following anomalies

1. Negative speeds - the simulator logs negative speeds.For example, i was going at 7.5 m/s, there is a deceleration of -15m/s^2, and the net speed is -7.5m/s^2. However, the offsets don't change, which means the vehicle is not moving(makes sense). 

2. From the deceleration values i see that about 7% of the decelerations occur at more than 1 g (9.8 m/s^2) In fact, the decelerations went as high has 3.8g in 10,0016 occurances. Obviously this is not (humanly) possible. Is this expected out of the model?

Could somebody let me know what could possibly be wrong in the configuration?

Regards

Pierre