My brief KU encounter!

[tjbender]

as the helicopter approached I saw a level 1 KU band on the right hand side

Well I am sure that it wasn't a traffic radar unit in the helicopter that was setting your detector.

When Aircraft speed enforcement is done, they use timing devices. Most common is a stop watch

Though I would love to see an aircraft radar enforcement attempt, just so I could laugh as the ticketing officer tried to explain to a judge how that 200'-wide beam was targeting MY car specifically.

[SmaartAasSaabr]

Yeah and think of the cosine angle at that....

Yes, the minimum speed limit on this road is 60 km/h, and we clocked the defendant driving 5 km/h and passing everyone on the road.

[SmaartAasSaabr]

But I am very curious. What does it say?

Here are the messages the belscorts with SWS reception will display

SWS Text Messages
Highway Construction or Maintenance
1 WorkZone
2 Road Closed
3 Bridge Closed
4 WorkCrew Highway
5 WorkCrew Utility
6 Detour
7 Truck Detour
8 MustExit
9 Rtlane Closed
10 CntrLane Closed
11 LeftLane Closed
12 Future use
Highway Hazard Zone Advisory
13 Police
14 Train
15 Low Overpass
16 BridgeUp
17 Bridge Wt Limit
18 RockSlid Area
19 School Zone
20 Road Narrows
21 Sharp Curve
22 Croswalk
23 Deer Crossing
24 Blind or Deaf Kid
25 SteepUse LowGear
26 Accident
27 PoorRoad Surface
28 Loading SchoolBus
29 DontPass
30 Dangrous Intrsect
31 Emergncy Vehicle
32 Future use
Weather Related Hazards
33 HighWind
34 Severe Weather
35 HeavyFog
36 Flooding
37 BridgIce
38 RoadIce
39 Dust Blowing
40 Sand Blowing
41 Blinding Snow
42 Future use
Travel Information/Convenience
43 RestArea
44 RestArea w/servic
45 24hrFuel
46 Insp Stn Open
47 Insp Stn Closed
48 Reduced Speed
49 Speed Enforced
50 HazMatls Exit
51 Expect Delay
52 10 Min Delay
53 20 Min Delay
54 30 Min Delay
55 1 Hour Delay
56 Traffic TunRadio
57 Pay Toll
58 Trucks ExitRght
59 Trucks ExitLeft
60 Future use
Fast/Slow Moving Vehicles
61 Emerg Veh Moving
62 Police Pursuit
63 Oversize Vehicle
64 SloMovng Vehicle

[StealthR1]

Its possible. But Im not sure what civilian aircraft use for radar altimeters....I know a person who owns a Cessna 340 with brand new avionics, maybe I can ask him what he uses and do some research.

He will almost certainly have a radar altimeter in his 340.

Many helicopters have them because they operate at low altitudes at night. It's also a common addition on well equipped IFR fixed wing aircraft too...like your friend's 340.

I wouldn't expect it to be very common on fixed wing LEO aircraft because many of them are mainly VFR operated. There would be no reason for them to have a radar altimeter.

...just my .02