Totally unrealistic, but I didn't get bored watching it, and it does have a 3-second traffic light scene featuring a car which is very much NOT fuel efficient. So I give it 4/5.

James Flavin is listed in IMDB with 452 credits screen credits including the arch-type comedy "It's A Mad, Mad, Mad, Mad World". His face and personna from one line and one shots to full supporting roles in movies, made him one of the most recognized of actors, albeit typecast somewhat. This is one of his first films and maybe his only leading role and he is quite good.
Addison Richards is listed in IMDB with 369 credits, again quite recognizable mostly in roles portraying authority figures of one kind or another. This is his first film role and it shows. Coming from stage work, he's a little stilted and ill-at-ease, but he does O.K.
I watched this film twice. I was trying to find out why it was ever made. All the people on the other side of the camera were pros who had long careers. Harry Webb, Barney Sarecky, Jack Natteford all top people. The film and sound production was excellant. Two real pros down in the supporting cast, John Elliot and Kit Guard, shine, given what they have to work with.
The film however is a disaster. Very tame and tepid for the era. Madge Bellamy top billed was a mis-cast non-acting mess. Pat O'Malley super bland. As a buddy comedy, or a crime story or a light romance it fails on all three counts. A curio for fans of the era only. Otherwise, you've been warned.

A couple of cops fight over a gangster's moll. The moll is to lure detective Bob to an apartment Gangster Diamond Jareck is lying in wait. Bob instead falls in love with Lil, who is being courted by detective McCue. Lil is involved in the kidnapping of a judge's daughter. Lil is being blackmailed by Diamond. The riot squad frees the kidnap victim and arrests Diamond. Lil is free to marry Larkin.
Now you know the whole movie so you don't have to watch it.