The car indicates a rapid progress; these images do not refer to anything physical.
To remain quiet for a time after the descent of Force is the best way of assimilating it.
The Peace comes fully at the meditation time because the Mother's concentration at that time brings down the power of the higher consciousness and one can receive it if one is able to do so. Once it begins to come, it usually increases its force along with the receptivity of the sadhak until it can come at all times and under all conditions and stay longer and longer till it is stable. The sadhak on his side has to keep his consciousness as quiet and still as possible to receive it. The Peace, Power, Light, Ananda of the higher spiritual consciousness are there in all veiled above. A certain opening upwards is needed for it to descend -- the quietude of the mind and a certain wide concentrated passivity to the descending Influence are the best conditions for the descent. If the pressure is too great, the remedy is to widen the consciousness. With the peace and silence there should come a wideness that can receive any amount of Force without any reactions.
So must the dim being grow in light and force
And rise to his higher destiny at last,
Look up to God and round at the universe,
And learn by failure and progress by fall
And battle with environment and doom,
By suffering discover his deep soul
And by possession grow to his own vasts.