Colorado Revised Statutes

Colo. Rev. Stat. § 42-4-903 (2026)

Turning movements and required signals

✓ current as of July 2026
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(1) No person shall turn a vehicle at an intersection unless the vehicle is in proper position upon the roadway as required in section 42-4-901, or turn a vehicle to enter a private road or driveway, or otherwise turn a vehicle from a direct course or move right or left upon a roadway unless and until such movement can be made with reasonable safety and then only after giving an appropriate signal in the manner provided in sections 42-4-608 and 42-4-609.

(2) A signal of intention to turn right or left shall be given continuously during not less than the last one hundred feet traveled by the vehicle before turning in urban or metropolitan areas and shall be given continuously for at least two hundred feet on all four-lane highways and other highways where the prima facie or posted speed limit is more than forty miles per hour. Such signals shall be given regardless of existing weather conditions.

(3) No person shall stop or suddenly decrease the speed of a vehicle without first giving an appropriate signal in the manner provided in sections 42-4-608 and 42-4-609 to the driver of any vehicle immediately to the rear when there is opportunity to give such signal.

(4) The signals provided for in section 42-4-608 (2) shall be used to indicate an intention to turn, change lanes, or start from a parked position and shall not be flashed on one side only on a parked or disabled vehicle or flashed as a courtesy or "do pass" signal to operators of other vehicles approaching from the rear.

(5) Any person who violates any provision of this section commits a class A traffic infraction.

Source: L. 94: Entire title amended with relocations, p. 2357, § 1, effective January 1, 1995. Editor's note: This section is similar to former § 42-4-803 as it existed prior to 1994, and the former § 42-4-903 was relocated to § 42-4-1003.

PART 10 DRIVING - OVERTAKING - PASSING Cross references: For penalties for class A traffic infractions, see § 42-4-1701 (3)(a)(I).

Notes of Decisions
Cited in 6 cases, 1997–2020 · leading case: People v. Burnett, 2019 CO 2 (Colo. 2019).
People v. Burnett, 2019 CO 2 (Colo. 2019). · cites it 141× “Supreme Court stating that an objectively reasonable mistake of law can support a finding that there was reasonable suspicion to justify an investigatory stop.”
v McBride, 2020 COA 111 (Colo. Ct. App. 2020). · cites it 16× “That statute, section 42-4-903, provides, in relevant part: (1) No person shall turn a vehicle at an intersection .”
v. Gutierrez & People v. Carrillo-Toledo, 2020 CO 60 (Colo. 2020). · cites it 20× “After briefly describing the relevant standards of review, we examine the plain language of section 42-4-903, C.R.S. (2019), the traffic statute Gutierrez allegedly violated.”
United States v. Rubio-Sepulveda, 237 F. Supp. 3d 1116 (D. Colo. 2017). · cites it 2× “At the suppression hearing, Officer Jelen testified that Detective Sprague contacted him, told him the Defendant was under investigation for “drug trafficking,” provided a “description and license plate number” for Defendant’s vehicle, explained that the task force had been…”
People v. in the Interest of H.J., 931 P.2d 1177 (Colo. 1997). “In addition, the driver violated sections 42-4-903 and 42-4-608, 17 C.R.S.”
State v. Johnson, 148 S.W.3d 338 (Mo. Ct. App. 2004). · cites it 2× “, Colorado: Colo.Rev.Stat. § 42-4-903(4) (1997); Texas: Tex.”
— Colo. Rev. Stat. § 42-4-903(1) — 3 cases
People v. Burnett, 2019 CO 2 (Colo. 2019). “Supreme Court stating that an objectively reasonable mistake of law can support a finding that there was reasonable suspicion to justify an investigatory stop.”
v McBride, 2020 COA 111 (Colo. Ct. App. 2020). “That statute, section 42-4-903, provides, in relevant part: (1) No person shall turn a vehicle at an intersection .”
v. Gutierrez & People v. Carrillo-Toledo, 2020 CO 60 (Colo. 2020). “After briefly describing the relevant standards of review, we examine the plain language of section 42-4-903, C.R.S. (2019), the traffic statute Gutierrez allegedly violated.”
— Colo. Rev. Stat. § 42-4-903(2) — 2 cases
People v. Burnett, 2019 CO 2 (Colo. 2019). “Supreme Court stating that an objectively reasonable mistake of law can support a finding that there was reasonable suspicion to justify an investigatory stop.”
v McBride, 2020 COA 111 (Colo. Ct. App. 2020). “That statute, section 42-4-903, provides, in relevant part: (1) No person shall turn a vehicle at an intersection .”
— Colo. Rev. Stat. § 42-4-903(3) — 1 case
People v. Burnett, 2019 CO 2 (Colo. 2019). “Supreme Court stating that an objectively reasonable mistake of law can support a finding that there was reasonable suspicion to justify an investigatory stop.”
— Colo. Rev. Stat. § 42-4-903(4) — 3 cases
People v. Burnett, 2019 CO 2 (Colo. 2019). “Supreme Court stating that an objectively reasonable mistake of law can support a finding that there was reasonable suspicion to justify an investigatory stop.”
State v. Johnson, 148 S.W.3d 338 (Mo. Ct. App. 2004). “, Colorado: Colo.Rev.Stat. § 42-4-903(4) (1997); Texas: Tex.”
v. Gutierrez & People v. Carrillo-Toledo, 2020 CO 60 (Colo. 2020). “After briefly describing the relevant standards of review, we examine the plain language of section 42-4-903, C.R.S. (2019), the traffic statute Gutierrez allegedly violated.”
— Colo. Rev. Stat. § 42-4-903(5) — 1 case
People v. Burnett, 2019 CO 2 (Colo. 2019). “Supreme Court stating that an objectively reasonable mistake of law can support a finding that there was reasonable suspicion to justify an investigatory stop.”
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