There’s a lovely review of Four on the Run on ReadPlus, review is by Kathyrn Beilby. Here’s a short extract:
This is a perfect read aloud for Junior Primary students as it is short and will appeal to children who could easily imagine that vehicles may be able to talk. Those younger readers who are progressing to independently reading novels will find the larger text and repetition of key words an asset to reading fluently. The clever illustrations by Cheryl Orsini provide extra interest and support to the reader.
You can read the whole review here.