Mlk,
1. A wise person sees what is coming. he should have davened BEFORE he started to drive. If he oculd not make it home in time from whatever emergency with which he dealyt (assumingthat it was an emergency) he should make arrangements to spendShabbat in the vicinity. If he could not he is now anoos and can daven an extra Amida after Maariv. Of course, if he is stopped completely there is no problem although he should put his car into neutral. Perhaps this is what the autot of the sefer meant.
2. How cany people habitually rush through the tefilla for various reasons?