  We analyze radio bursts observed in events with interacting/non-interacting
CMEs that produced major SEPs (Ip $>$ 10 MeV) fromApril 1997 to December
2014.We compare properties of meter (m), deca-hectometer (DH) type II as well
as DH type III bursts, and time lags for interacting-CME-associated (IC) events
and non-interacting-CME-associated (NIC) events. About 70\% of radio emissions
were observed in events of both types from meters to kilometers. We found high
correlations between the drift rates and mid-frequencies of type II radio
bursts calculated as the mean geometric between their starting and ending
frequencies for both NIC and IC-associated events (Correlation coefficient
\textit{R}$^{2}$ = 0.98, power-law index $\varepsilon$ = 1.68 $\pm $ 0.16 and
\textit{R}$^{2}$ = 0.93, $\varepsilon$ = 1.64 $\pm $ 0.19 respectively).We also
found a correlation between the frequency drift rates of DH type II bursts and
space speeds of CMEs in NIC-associated events. The absence of such correlation
for IC-associated events confirms that the shock speeds changed in CME--CME
interactions. For the events with western source locations, the mean peak
intensity of SEPs in IC-associated events is four times larger than that in
NIC-associated SEP events. From the mean time lags between the start times of
SEP events and the start of m, DH type II, and DH type III radio bursts, we
inferred that particle enhancements in NIC-associated SEP events occurred
earlier than in IC-associated SEP events. The difference between NIC events and
IC events in the mean values of parameters of type II and type III bursts is
statistically insignificant.
