In Australia this topic would be called “kangaroo whistles” (which can be attached to a vehicle to scare off kangaroos)
Nearly everything said so far could apply (kangaroos are unpredictable, the whistles may not work, etc)
Just this morning at around 2am, on the M4 in Western Sydney (a major highway), a motorcyclist was reportedly killed by a kangaroo that crossed the highway and bounded straight into him, pushing him into the Armco barrier. Normally kangaroos are around at dawn and dusk so this is an unusual time for a kangaroo strike.
Seagrass
A few weeks ago I was returning from Temora in NSW to my home in Melbourne, Victoria and I had three near misses with 'roos within 3 minutes.
I was really unprepared for this as it was around 9.30-10.00am. They are not usually seen much an hour or so after sunrise.
Two, together come from the scrub on the RH side of the road (we drive on the LHS). They took two or three hops parallel to me on the bitumen.
One then turned sharp left and crossed about 1 metre in front of my wheel. The other took one more hop but moved slightly left towards me and then disappeared.
It was so close that it disappeared, completely out of sight, under my right arm.
I was braking heavily (from about 100pkh) and braced for the impact and subsequent crash but it never happened.
I don't know how we did not connect but there was not even the slightest touch.
This scared the ***p out of me and I slowed to about 60-70kph thinking that there might be more from the same "mob" nearby.
Less that 3 minutes later, another one came from the RHS but about 15 metres in front of me and bounded along the road ahead of me for about 100 metres then crossed over to the LHS in the same manner as the first two. By this time I had slowed to about 30-40kph and was not too worried about this particular one.
For the next 10 minutes or so, until I got out into clearer territory, I stayed at 50kph.
I never saw another live one that day but did see several "deceased" ones.
I did not tell the Lady of the House about it as I decided that was the wisest thing to do. :wink:
Macka