I found this wording about the frequency range of radar in the nhtsa.dot.gov :P
2.6 Microwave Transmission

The microwave characteristics of transmission frequency and frequency stability, input current stability, radiated output power stability, antenna horizontal beamwidth, and antenna near-field power density shall be measured in accordance with 5.6 and shall meet the following requirement:

2.6.1 Transmission Frequency and Frequency Stability. When operated at the standard supply voltage (c.f. 3.1.3), the transmission frequency shall be within the assigned frequency band of 10,500 MHz to 10,550 MHz for X-band radar devices, 24,050 MHz to 24,250 MHz for K-band radar devices, and 33,400 MHz to 36,000 MHz for Ka-band radar